Free Grade 12 Computer Science Worksheets with Answers

Grade 12 Searching & Sorting

3B-AP-10

Counting the steps in linear and binary search and tracing bubble and selection sort passes.

e.g. Bubble sort (smallest to largest). Write the list after the first full pass: 19, 8, 5, 41, 37, 30

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Grade 12 Algorithm Efficiency (Big-O)

3B-AP-11

Comparing how the number of steps grows: O(1), O(log n), O(n) and O(n²).

e.g. What is the time complexity of this code: for x in range(17):; print(x)? Choose O(1), O(log n), O(n) or O(n²).

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Grade 12 Recursion

Tracing recursive functions like factorial, Fibonacci and sums, and counting calls.

e.g. def p(b, e): if e == 0: return 1; return b * p(b, e - 1). What is p(2, 3)?

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Grade 12 Functions & Return Values

Tracing functions with parameters and return values, including functions that call other functions.

e.g. def f(x): return 2 * x + 1. What does print(f(f(3))) show?

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Grade 12 Lists & Arrays

3B-AP-12

Indexing, slicing and changing lists, and finding their length and values.

e.g. nums = [40, 18, 11, 4, 19, 21, 45]. What is nums[2:6]?

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Grade 12 Tracing Code (Python)

Reading short Python programs with variables, if/else and loops and working out what they print.

e.g. x = 20. if x > 10: print("big") elif x == 10: print("equal") else: print("small"). What is printed?

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Grade 12 Logic Gates

3B-CS-02

Working out the outputs of AND, OR, NOT and XOR gates and small logic circuits.

e.g. A circuit computes (A OR B) XOR C with A = 1, B = 0, C = 0. What is the output?

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Grade 12 Hexadecimal

Converting between hexadecimal, decimal and binary, and reading hex colour codes.

e.g. What is the hexadecimal number AE in decimal?

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Grade 12 Binary Numbers

Converting between binary and decimal with place values 1, 2, 4, 8 … and adding binary numbers.

e.g. What is the binary number 100000 in decimal?

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Grade 12 Networks & the Internet

How networks move data: devices, IP addresses, packets and download times.

e.g. Which device turns your typing into data the computer reads: speaker, keyboard, or router?

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Grade 12 Cybersecurity & Passwords

Password strength by counting combinations, spotting threats, and simple encryption.

e.g. A password is 2 lowercase letters (a–z). How many passwords are possible?

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Grade 12 Computing Challenge Puzzles

Challenge

Puzzles that stretch computational thinking: bit patterns, logic and clever counting.

e.g. What is the largest whole number you can store in 7 bits?

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