CBSE Class 12 Biology Previous Year Papers
Official CBSE board exam question papers for Class 12 Biology — 2025-26, 2024-25, and 2023-24. All sets and series included. View directly on this page or download the PDF free.
About these papers
- ✓Actual CBSE board exam papers
- ✓All sets and series included
- ✓3 years: 2023-24 to 2025-26
- ✓Best way to understand exam pattern
- ✓Free to view and download
How to use: Start with the most recent year (2025-26). Pick any set, attempt it in 3 hours under exam conditions, then evaluate your answers. Compare across sets to spot recurring question types.
Series 1
Series 2
Series 4
Series 5
Series 6
Series 7
Select a set above to view the paper.
Repeat Questions Analysis
Chapters that appeared in CBSE board exams across the last 3 years. These are your highest-priority chapters — every hour spent here gives maximum return on exam day.
Chapter / Topic
Years
What to Expect
Sexual Reproduction in Flowering Plants
Almost Certain · 3/3 years3-mark pollination + fertilisation diagram
Human Reproduction
Almost Certain · 3/3 years5-mark diagram of male/female reproductive system
Principles of Inheritance (Mendel)
Almost Certain · 3/3 years3 or 5-mark cross problems
Molecular Basis of Inheritance
Almost Certain · 3/3 years5-mark DNA replication or protein synthesis
Human Health & Disease
Almost Certain · 3/3 years3-mark immunity types or disease
Biotechnology — Principles & Process
Almost Certain · 3/3 years3-mark recombinant DNA technology
Ecosystem
Almost Certain · 3/3 years3-mark energy flow or food chain
Reproductive Health
Very Likely · 2/3 years2-mark contraception or MTP
Strategy: Master all Almost Certain chapters first — these alone can get you 70%+ of your marks. Then cover Very Likely chapters for the rest.
How to Use PYQs Effectively
Attempt under exam conditions
Set a 3-hour timer. No phone, no notes. Treat every PYQ as a dress rehearsal for the board exam.
Identify repeating patterns
Chapters that appear in 2 or more years are guaranteed important. Prioritise those in your revision.
Track your score year by year
Do 2023-24, then 2024-25, then 2025-26. If your score improves, you're on the right track.
Plug gaps with chapter practice
Every wrong answer points to a weak chapter. Practice that chapter on ClearSteps before moving to the next paper.
Know your weak spots. Fix them before the exam.
ClearSteps gives you chapter-wise mock tests for CBSE Class 12 Biology with AI evaluation against the official marking scheme — so you know exactly where you stand.