Stop re-reading. Test yourself until it sticks.
Pick a subject and take a topic test. Every answer shows the reason at once, and a timed mock paper shows which topics need more work.
6.3 Data RepresentationSample 1 of 2
What is the denary (base 10) equivalent of the 8-bit binary number 00101101?
Subjects ready to practice
Study one topic at a time with worked explanations, or sit a timed 60-minute mock paper.
Exams and certifications
- ZIMSEC O-Level Computer Science (4021)440 questions
All 11 syllabus topics from Hardware and Software (6.1) to Emerging Technologies (6.11), plus a 40-question Paper 1 mock.
- AWS Certified Cloud Practitioner (CLF-C02)48 questions
Cloud Concepts, Security, Technology, and Billing, with links to AWS documentation on every explanation.