ASPast paper9618 Paper 11 · May/Jun 20252026196 views
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ
Free forever · 2210 · 0478 · 9618
Stop revising.
Start running it.
Cambridge O Level, IGCSE and A Level Computer Science (2210 · 0478 · 9618) — where pseudocode, Python, SQL, assembly and Prolog actually run, every topic has its notes and an assignment with solutions, the past papers are already sorted, the quizzes and past papers mark themselves and the tutor reads a photo of your question and answers at 2 a.m. Built by ZAK, the teacher behind 25+ years of A*s in Karachi.
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grade.pseudo · CAIE 9618
Press Run — this is a real interpreter, not a picture.
“Don't let yesterday take up too much of today.” — Will Rogers ✦“If you think your teacher is tough, wait till you get a boss.” — Bill Gates ✦“Everyone should learn how to program a computer, because it teaches you how to think.” — Steve Jobs ✦“The best way to predict the future is to invent it.” — Alan Kay ✦“I am not a teacher, I am an awakener.” — Zafar Ali Khan ✦“Move fast and break things — then fix them, with a trace table.” — ZAK, probably ✦“Don't let yesterday take up too much of today.” — Will Rogers ✦“If you think your teacher is tough, wait till you get a boss.” — Bill Gates ✦“Everyone should learn how to program a computer, because it teaches you how to think.” — Steve Jobs ✦“The best way to predict the future is to invent it.” — Alan Kay ✦“I am not a teacher, I am an awakener.” — Zafar Ali Khan ✦“Move fast and break things — then fix them, with a trace table.” — ZAK, probably ✦
Just landed · updated 17 Oct 2026
What's new on CS with ZAK
AskZ now reads your photos and papers, the real past paper marks itself end to end, and every page has its own help. Here's what changed — on the website and in the ZAPP app.
New17 Oct 2026
ZAK's books: prices, sets and ordering in a few taps
Every book, workbook and ebook now shows its price, and each level has a set of two books and two workbooks that costs less than its parts. Add it to your basket and the order goes straight to the books desk on WhatsApp.
- Sets for O Level (current and new syllabus), AS, A2 and Full A Level
- Black and white, full colour or ebook
- Free delivery on every printed set in Pakistan
- Printed fresh for your order, delivered in 7–10 working days
Choose your set
New16 Oct 2026
University Planner and CS admission deadlines
Tick your A Levels and see which Computer Science, Software Engineering, AI, Data Science and Computer Engineering degrees stay open in Pakistan and abroad — with the reason and each university's own rule. Every admission date we could verify is in one calendar.
- What if I drop Physics? See what closes
- IBCC equivalence calculator, IBCC's own method
- Parents' table as a PDF
- UCAS, SAT, AP CS, TMUA, NUST, LUMS, IBA, Habib dates in your calendar
Open the planner
Also new · 6
New17 Oct 2026Listen to ZAK's ebooksPress the headphones in the ebook reader and the chapter is read to you, with each sentence and word lit up on the page as it is spoken. Your device's voice starts at once and works offline; the AskZ voice gives a natural teacher's voice.Try the free sample chapters Improved17 Oct 2026Games on the topics you've studied so farHaven't finished the syllabus yet? Pick What I've studied in any game, tick the topics your class has covered, and the quiz, flashcard, trace and escape games ask only about those. The list is shared by every game.Play a game Improved17 Oct 2026Ask Z answers university and parents' questionsAsk Z now answers which degrees your A Levels keep open, entry tests, IBCC and admission dates, straight from the University Planner's checked sources. Parents can ask it anything about the site and their child's progress.Ask Z a question New16 Oct 2026Examiner's Traps: real exam mistakes, 15 seconds eachA fast true-or-false game built from the mistakes Cambridge examiners reported in their reports. Every trap names its paper and links to the question it came from.Dodge the traps New16 Oct 2026Python Paths: learn Python one checked step at a timeTwo numbered Python courses, O Level / IGCSE and 9618 Paper 4. Each step asks for one small program and checks it the moment you run it, against tests you can see and tests you can't.Start a Python Path New16 Oct 2026New game: OpcodeZ — program the CPU in 9618 assemblySolve memory puzzles in real Cambridge assembly: load, point, loop and mask until every memory layout comes out right, hidden ones included. Then chase two medals that pull against each other: fewest instructions and fewest cycles.Program the CPU
For parents · For university applicants
For parents
Follow your child's Computer Science, from your own phone
Everything here is free. With your child's invitation you see a read-only summary of their week and get a short email every Sunday — never their chats or answers.
- What the site gives your child
- How Ask Z is kept safe
- Ideas to help at home
Read the page for parents
For university applicants
Which CS degrees do your A Levels keep open?
42 Computer Science, Software Engineering, AI, Data Science and Computer Engineering degrees at 34 universities in 12 countries, each with its own rule and source. IBCC calculator and a parents' table included.
- What if I drop a subject?
- Entry tests and IBCC
- Every verified admission date
Open the University Planner Admission deadlines
Pick your level
Every topic. Every paper. Nothing you have to hunt for.
Each topic page bundles AskZ-written Smart Notes, an assignment with solutions, videos, topical past-paper questions with mark schemes, a quiz, a flashcard deck, infographics and runnable pseudocode. Three clicks from here to revising.
2210 · 0478
O Level
Paper 1 theory + Paper 2 problem-solving. Where the habit starts.
- 10
- topics
- 1,671
- real exam Qs
- 474
- quiz Qs
- 613
- flashcards
Open O Level
9618
AS Level
Papers 1 & 2. Theory gets deeper, pseudocode gets real.
- 12
- topics
- 690
- real exam Qs
- 541
- quiz Qs
- 643
- flashcards
Open AS Level
9618
A2 Level
Papers 3 & 4. OOP, recursion, files, the lot.
- 8
- topics
- 484
- real exam Qs
- 415
- quiz Qs
- 499
- flashcards
Open A2 Level
NewCS Games · 16 to play
Bored of revising? Play it instead.
Quiz battles, a daily CS word, SQL whodunnits, logic-gate puzzles and arcade — every game drills the syllabus. Solo against AskZ bots, with friends, or with your whole class. Free, no sign-up.
New Discussion Corners
Stuck? Ask the corner — @AskZ joins in.
Ask and answer Computer Science with students taking the same papers. Accepted answers, teacher endorsements, code you can run, and ZAK's AI tutor in every thread. Nicknames only, no private messages.
Open the cornersNot just notes
Tools that do the boring part for you.
Five languages that run in your browser — pseudocode, Python, SQL, assembly and Prolog — AskZ-written notes and assignments for every topic, and everything else below. All live on this page; nothing is a screenshot.
Real interpreter
ZAK's Pseudocode Playground
The full CAIE 9618 pseudocode standard, running in your browser: records, files, classes, recursion, pointers, exceptions. 112 worked examples (and the same again in Python), a trace table for every run, and errors that point at the exact line. You already ran it in the hero.
PROCEDURE Swap(BYREF A, B : INTEGER)
DECLARE T : INTEGER
T ← A
A ← B
B ← T
ENDPROCEDURE
$ X=7 Y=3 → X=3 Y=7 ✓
Open the Playground
New · written by AskZ
AskZ Smart Notes
Complete notes for all 30 topics, written once by AskZ from ZAK's material, the syllabus, the mark schemes and past papers — with that topic's infographics, quiz, flashcards and real exam questions woven in. Highlight anything to ask about it.
- Reads like ZAK's notes
- Saved on your device, works offline
- Slides download
Open the notes library
New · with solutions
ZAK Assignments
A full assignment for every topic — 3 sets each, 90 in all — built from ZAK's own class assignments and real past papers: figures, model answers, a mark scheme and an examiner's tip on every part. Answer on a typeset paper — table cells, code gaps, tick boxes — have AskZ mark every part for XP, or print the PDF on ZAK's letterhead.
- Set A
- Set B
- Set C
Browse the assignments
Seven languages and tools that really run in your browser — and mark you.
- Paper 2 & 4
Python, Java & VB.NET Playgrounds
Real Python 3, the real Java compiler and Microsoft's VB.NET compiler — all in your browser, with input, files, classes and a trace table. 63+ examples in each language.
def fact(n):
return 1 if n == 0 else n * fact(n - 1)
for i in range(1, 6):
print(i, fact(i))
1 1
2 2
3 6
4 24
5 120
Paper 2 & 4
Python, Java & VB.NET Playgrounds
Real Python 3, the real Java compiler and Microsoft's VB.NET compiler — all in your browser, with input, files, classes and a trace table. 63+ examples in each language.
def fact(n):
return 1 if n == 0 else n * fact(n - 1)
for i in range(1, 6):
print(i, fact(i))
1 1
2 2
3 6
4 24
5 120
Databases
SQL Lab
48 queries against a ready-made school database — joins, GROUP BY, DDL — with real keys and referential integrity.
AS & A2
Assembler & CPU simulator
Every 9618 instruction, stepped through an animated fetch–decode–execute cycle with the exam trace table.
A2
Declarative Lab (Prolog)
Facts, rules, queries, backtracking — with the errors an A2 examiner would flag.
Paper 2
Flowchart Studio
Draw a flowchart with the Cambridge symbols and run it; type pseudocode and watch the chart draw itself; check your drawing against the mark scheme.
Paper 2
Trace tables, generated
Paste any algorithm and watch the table fill in. The exact skill Paper 2 tests.
Auto-marked
Programming tasks, auto-marked
Exam-style scenario tasks marked against hidden boundary and abnormal tests — pseudocode or Python — with a model answer after two attempts.
AS & A2
Data structures, live
Stacks, circular queues, linked lists with a free list, binary trees and hash tables — the arrays and pointers the 9618 mark scheme draws.
Paper 1
Networks Lab
Corrupt a bit and let the parity block find it, route packets, cut up an IP address, walk the TLS handshake, break a blockchain.
Paper 1
Logic gates lab
Type a Boolean expression, get the circuit and the truth table instantly.
A2 §15.2
Boolean algebra & K-map lab
Karnaugh maps looped the way Cambridge draws them, every algebra law named, adders and flip-flops live — and Paper 3 practice marked like the mark scheme.
Paper 1
Number systems lab
Binary, hex, two's complement and A2 floating point, with the working shown. Practice mode included.
Visual
65 exam-ready infographics
One diagram per idea, downloadable as PNG or SVG. Print them, stick them on the wall.
Practice
Quizzes that mark themselves
1,430 MCQs with an explanation for every answer. Wrong ones come back until you get them.
Play
16 CS games
Quiz battles, find-the-Imposter, a binary match-3, a daily CS word, assembly golf, gate puzzles, an SQL whodunnit, tower defence and more. Play solo against AskZ bots, with friends, or with your whole class from one code.
Watch
572 video lectures
522 hours of ZAK's YouTube — topic lectures, past-paper walkthroughs, Zakathon marathons — indexed by syllabus topic and playable right here.
Mark schemes + examiner comments
2,415 real exam questions
Every CS question Cambridge has asked since 2015 (and the still-relevant ones back to 2010), sorted by topic, with the mark scheme — and what the examiner said about it — one tap away. Jump straight to any year, session and paper, sit a timed paper, or answer on the real printed paper — type, draw circuits, loop K-maps, add in binary, write code — and press Mark: AskZ and the site's own engines mark every part.
Never before
The Statometer
Every topic measured against 180 real Cambridge papers: the odds it is set next time, marks a paper, trend, command words, what inside it gets asked — ranked, and re-ordered by your own quiz record. Updates itself with every new session.
Complete
Past paper finder
Every 2210, 0478, 9618 and 9608 paper since 2015: QP, MS and examiner reports, filtered by year, session and variant.
Exam technique
29 command words, decoded
State, Describe, Explain, Evaluate… what each one wants from you, the mark it loses, and a real question stem for each.
Teachers
Paper Builder — for teachers
Build a class test, monthly, mid-term or mock from real past papers and AskZ-written questions, share one link your class sits, and download it on ZAK's letterhead. Change the paper tells AskZ why, then swaps only the questions you pick. Teachers request access with a school email.
Organise
Exam planner
Your zone's paper dates and Key Times, a live countdown, calendar export and a week-by-week revision plan.
Reference
Pseudocode ↔ Python
Every construct side by side with its Python equivalent. The Paper 2 and Paper 4 cheat sheet.
Reference
Glossary: 203 key terms
Every syllabus term defined in the words that earn the mark, linked to the topic where it is taught.
Official
Syllabus + specimen papers
The official 2210, 0478 and 9618 PDFs, pseudocode guides and every specimen paper with its mark scheme — including the 2029 ones.
Every tool at a glance · 26
2,415
real exam questions, by topic
1,430
auto-marked quiz questions
30
topics, each with Smart Notes + assignments
65
exam-ready infographics
435
runnable examples in 7 languages
522
hours of video lectures, by topic
2015→
every past paper since
Zafar Ali Khan
O & A Level Computer Science Educator · Entrepreneur · Programmer at Heart · President & Co-founder, ByteCorp · Creator of AskZ
The person behind the site
“I am not a teacher.
I am an awakener.”
A proud Pakistani educator, entrepreneur and programmer at heart: twenty-five years of O and A Level Computer Science (0478, 2210, 9618) across Karachi's most renowned institutes, thousands of students, A*s and CAIE distinctions every session, and an online following of 65,000+ wherever CAIE CS is offered. ZAK built this free platform because the resources students actually needed did not exist — so he wrote the interpreter, sorted the papers, shot the lectures and trained the tutor himself.
- The City School
- Beaconhouse
- Alpha College
- Cedar College
- Whales College
- Sceptre College
- Nixor College
- Foundation Public School
- Credo
- Heuser College
- Reads College
- DHA Public School
Watch ZAK teach it
Every lecture, indexed by syllabus topic.
572 videos — 522 hours — from ZAK's YouTube channel, each tagged with the topic it teaches. New uploads land here on their own. These are the latest; press play.
ASPast paper9618 Paper 11 · Oct/Nov 20252026180 views
A2Past paper9618 Paper 32 · Oct/Nov 20252026114 views
A2Past paper9618 Paper 31 · Oct/Nov 20252026236 views
From the blog
Exam technique, study skills, real talk.
72 posts from ZAK, pulled live from the blog.
- Why every cover of my new books is a heat map of the examBismillah. For years students have asked me one question more than any other: "Sir, which book should I follow?" Today I can finally give a complete answer. · 2 min · Blogger
- The 7 Pseudocode Mistakes That Cost You Marks in Paper 2Forgetting ENDIF, using ELSE IF, off-by-one FOR loops — the examiner has seen every one of these. Here's the checklist to run before you put your pen down. · 6 min
- How to Read a Mark Scheme Like an ExaminerThe mark scheme is the closest thing to the examiner's brain. Learn what 'any two from' really means, why command words matter, and how to stop dropping easy marks. · 5 min
The ZAK community
65,000+
students and teachers follow ZAK across 8 pages, groups and channels — wherever CAIE Computer Science is offered.
- 33K+
O Level Computer Science
- 9.5K+
A Level Computer Science
- 8.3K+
ZAK on YouTube
- 7.1K+
O Level CS study group
- 6.2K+
Zafar Ali Khan
- 1.1K
@zakonweb
- 376
zakonweb
- 20
CS with ZAK on Discord
Live · 18 hours ago5 networks · refreshed from each platform daily
- Facebook Page
O Level Computer Science
facebook.com/OLevelComputer
33K+
followers
Paper 1 & 2 tips, topical questions and every new resource for 2210 / 0478, the day it lands.
Follow
- Facebook Page
A Level Computer Science
facebook.com/ALevelComputer
9.5K+
followers
9618 Paper 1–4 walkthroughs, pseudocode drills and exam-week reminders.
Follow
- YouTube Channel
ZAK on YouTube
youtube.com/zakonweb
8.3K+
subscribers · 573 videos · 857K views
Full topic lectures and past-paper solutions, recorded the way ZAK teaches them in class.
Subscribe
- Facebook Group
O Level CS study group
facebook.com/groups/olevelcomputer
7.1K+
members
The 2210 / 0478 discussion group ZAK started for his own students — ask anything, someone has been stuck there before.
Join
- Facebook Page
Zafar Ali Khan
facebook.com/zakonweb
6.2K+
followers
ZAK himself — announcements, ZAKATHON, admissions and the occasional classroom story.
Follow
- Instagram Profile
@zakonweb
instagram.com/zakonweb
1.1K
followers · 141 posts
Infographics, one-minute concepts and behind-the-scenes from ZAKATHON.
Follow
- GitHub Profile
zakonweb
github.com/zakonweb
376
followers · 16 public repos
The code behind the labs, the interpreter and ZAK's open-source teaching tools.
Follow
- Discord Server
CS with ZAK on Discord
discord.gg/ZSWzS2azBm
20
members · 1 online now
Open to every 2210 / 0478 / 9618 student: the daily question, MCQ and trace-it, threads to argue the mark scheme, and Ask Z on call — type /askz.
Join
- Facebook Group
A Level CS discussion group
facebook.com/groups/computing9691
Members only
private group · ask to join
Running since the 9691 days: 9618 questions, answers and mark-scheme arguments, every session.
Join
Counts are read from each platform once a day — where a network only publishes a rounded figure it is shown with a +. The groups are private, so their member counts are checked by hand. Prefer WhatsApp? Message ZAK directly.
Testimonials
What students say.
Real students, real schools, real results — every testimonial is submitted with credentials and approved by ZAK before it appears.
O Level / IGCSE Featured
I had the privilege of being taught Computer Science by Sir Zafar Ali Khan during my O and A Levels, and I will always be deeply grateful that I was his student. He is an exceptional teacher, but what I value most is the genuine care, generosity and selflessness he has always shown me. He gave me his time, knowledge and support so freely, often going far beyond what anyone could expect from a teacher. Much of the confidence and passion for learning that I carried forward in life began in his classroom, and I truly believe his influence played a part in the person I became. Even years later, he has never hesitated to guide or help me whenever I have reached out. Some teachers leave you with good grades Sir Zafar left me with something far more lasting. I can never fully thank him for everything he has done for me, and I feel incredibly fortunate to still call him my mentor.
A Level Featured
ZAK didn’t just teach Computer Science; he had an incredible way of inspiring and uplifting his students. From supporting us in the classroom to being there for us and responding even after class hours, ZAK always went above and beyond. The love for CS that I developed started with his classes, and I’m genuinely grateful for that foundation. With technology evolving so rapidly, I can only imagine how much more enriching the experience of learning from him must be today
A Level Featured
I was fortunate to study A-level Computer Science with this teacher in Pakistan. He made the classroom welcoming, explained difficult concepts clearly, and always made learning enjoyable. His teaching has stayed with me well beyond A-levels. The foundation he gave me in computer science, especially low-level languages, has been incredibly helpful as I study at Simon Fraser University in Canada. Many of the concepts we covered and assignments we completed prepared me for my first- and second-year university courses. He is a friendly, dedicated, and truly excellent teacher. I’m grateful for the confidence and strong foundation he helped me build.
Cambridge · Edexcel · AQA · OCR · WJEC Eduqas · CCEA · IB
Every board.
Every subject.
Ask Z.
Revision that knows your syllabus. AskZ began here with Computer Science; at askzbot.com the same tutor covers every subject on seven boards, with the real paper structure and marking that follows the mark scheme.
45 days free. No card.Then Free forever, or pay per subject for the ones you sit.
Sitting Cambridge Computer Science? It is complimentary, in full, right here — start on cswithzak.com.
Free forever
- Yearly full past papers, free forever
- Every syllabus point, mapped to papers
- Topic one of every subject: notes, questions, flashcards
- The tutor answers every day on the Free plan
01
Pick your syllabus
Choose your board and the exact code you are entered for. Series, syllabus years and the official PDF come with it.
02
Practise with real paper structure
Papers, command words, mark tags like [3] and timings match the exam, so nothing on the day looks new.
03
AskZ marks and explains
Type or photograph an answer. AskZ marks it against the mark scheme and shows the marks you lost and why.
For Students
Pick the subjects you sit this session. They're yours until the last paper.
Find your subject →
For Parents
One Family plan pools subjects across up to four students — every board, one bill.
Family plan →
For Tutors
Your students' syllabus, papers and marking in one place, so lessons start from the mark scheme.
Plans →
For Schools
Campus seats give every student every subject, with the real paper structure for every board you offer.
Campus →
askzbot.com is the AskZ platform for every board and every subject. Computer Science stays free here on cswithzak.com.
Every May
ZAKATHON
Marathon revision workshops right before the CAIE papers. Started as an experiment with a few students in a room, now fills an auditorium every year.
About the endeavourLearn with ZAK in person
Small-group classes for O Level, AS and A2 across 5 centres in Karachi, plus live online sessions for students anywhere.
Centres & registration Cloud drives
Success Packs
Everything ZAK gives his own students, in one drive. ZAK's notes, tests and mocks plus every CAIE paper, mark scheme and examiner report — one drive per level, updated every session.
What's insideYour A* starts with one topic.
Pick a level, open a topic, read the notes, run a bit of pseudocode — or Python, SQL, assembly, Prolog — and try the assignment. That's it. Come back tomorrow and the streak counter does the rest.
