One sub-topic. One weekend. Done properly.
Short live online classes with ZAK on a single Computer Science sub-topic — 1 to 3 days at the weekend, 1 to 2 hours a day. Come stuck, leave able to answer the exam questions.
One byte
Each class is one or two syllabus sub-topics — 1.1 Number systems, 8.2 Arrays, 15.2 Boolean algebra, 19.2 Recursion — never a whole chapter.
1 to 3 days
Saturday, Sunday or both, sometimes over two weekends. Small enough to fit around school and other subjects.
1 to 2 hours a day
Short, focused live sessions: teach, worked past-paper questions, then you try with ZAK watching.
Live online
On Zoom, Google Meet or Teams — the link reaches you on WhatsApp after you book. Join from anywhere.
On the calendar
Upcoming Byte Size Tuitions.
Pakistan time. Book on WhatsApp — the admissions team confirms your place and sends the class link.
The next Byte Size Tuitions are being planned.
New classes appear here, on What's new and on ZAK's pages as soon as they are set. Tell the admissions team which topic you need.
Ask on WhatsAppVote
Which byte should ZAK teach next?
Each option is one syllabus sub-topic — small enough for a weekend. Rank your top three. The most-wanted ones — weighed with how many marks they carry in the exam — become the next Byte Size Tuitions, and you can book them as soon as they are announced.
- 1st
- 2nd
8.1 Totalling, counting and string handling (length, substring, upper, lower); arithmetic, relational and logical operators; nested statements
0 points · 0 votersBanker · 98
- 3rd
- 4th
- 5th
- 6th
- 7th
7. Algorithm Design and Problem-Solving
Test data (normal, abnormal, extreme, boundary); trace tables for dry runs; identifying and correcting errors in algorithms
0 points · 0 votersBanker · 83
- 8th
- 9th
- 10th
Each option is one syllabus sub-topic — a byte that fits in a weekend, not a whole chapter. Order = 70 % students' votes + 30 % how much that sub-topic is worth in the exam (Statometer). One ballot per account and level; after a sub-topic's class runs, its votes start again.
How it works
Book, pay, join.
- 1
Pick a class
Choose a Byte Size Tuition below for your level, or ask for a topic you need.
- 2
Book and pay in advance
Tap Book on WhatsApp. The admissions team confirms your place and sends the payment details — bank transfer or Raast in Pakistan.
- 3
Get the link
Once your place is confirmed you get the class link and what to bring, on WhatsApp.
- 4
Keep practising here
After the class, the topic's notes, quizzes, flashcards and past-paper questions on this site are free — as they always are.
Paying for a place
Bank transfer or Raast in Pakistan — the admissions team sends the details when you book. Send the receipt on the same chat with the class name.
Your topic
Need a topic that isn't listed?
Ask for it. Topics many students ask for go on the calendar first.
Not sure which topic? The Statometer shows which topics carry the most marks on each paper.
Questions
Byte Size Tuitions, answered.
What is a Byte Size Tuition?
A short live online class on one Computer Science sub-topic (one or two syllabus bullets, never a whole chapter): 1 to 3 days at the weekend, 1 to 2 hours a day, taught by ZAK for O Level / IGCSE (2210 / 0478) or AS and A2 (9618).
Who is it for?
Students who are fine with most of the course but stuck on one topic, students studying on their own or with another teacher, and anyone revising a topic before a test or the Cambridge papers.
How do I book and pay?
Tap Book on WhatsApp on the class. The admissions team confirms your place and sends the payment details. Places are confirmed once paid, before the first day.
What if I miss a day?
Tell the admissions team on WhatsApp before the day. The topic's notes, past-paper questions and lectures on this site cover the same ground for free.
Can I choose what is taught?
Yes — vote. Rank your top three sub-topics on this page; the most-wanted ones, weighed with how many marks they carry, go on the calendar first.
Does it change what is free on the site?
No. Everything on CS with ZAK stays free. A Byte Size Tuition is an optional live class with ZAK.
Everything on CS with ZAK stays free — a Byte Size Tuition is an optional live class. Prefer a full course? See weekly classes.
