O Level / IGCSE Biology mock test 3: full length paper
By Team Megalecture · Updated 4 Nov 2026
40 exam-style questions in 60 minutes, spread across the syllabus the way the real paper is. Sit it in exam mode with the timer, then see your mark, the right answer and an explanation for every question, and your score by chapter.
40 questions · 60 minutes · 17 chapters
What is in this paper
The questions are fixed, so you can sit the paper once as a real mock and compare attempts. By chapter:
- Cells 1 questions
- Classification 2 questions
- Movement into and out of cells 1 questions
- Biological molecules 1 questions
- Enzymes 2 questions
- Plant nutrition 1 questions
- Human nutrition 3 questions
- Human gas exchange 1 questions
- Respiration 2 questions
- Transport in humans 4 questions
- Disease and immunity 3 questions
- Excretion 1 questions
- Coordination and control 3 questions
- Development of organisms and continuity of life 5 questions
- Inheritance 5 questions
- Biotechnology and genetic modification 2 questions
- Relationships of organisms with one another and with the environment 3 questions
How it works
- Exam mode keeps the marks until you finish and runs the 60-minute clock, like the real paper.
- Practice mode shows the answer and explanation after every question, with no clock.
- When you finish you get your mark, a grade band, and the chapters to revise next.
- Every question you get wrong is kept in My mistakes to retry.
O Level / IGCSE Biology mock 3: questions students ask
Is O Level / IGCSE Biology mock 3 a past paper?
No. It is 40 of our own questions, written to the syllabus in the style of the real paper and fixed, so it can be sat once as a proper mock and then reviewed.
How long is the paper?
60 minutes for 40 questions, timed in exam mode. Practice mode shows each answer as you go, with no clock.
How is it marked?
Instantly: your mark, a grade band, the right answer and an explanation for every question, and your score chapter by chapter.
Can I take it again?
Yes. Your best mark and every attempt are kept on the subject page, and the questions you got wrong go to My mistakes.
The other papers
Mock 1Mock 2Mock 4Mock 5All O Level / IGCSE Biology chapters