Class 12 Biology

This is your complete, chapter-wise practice hub for Class 12 Biology. Every question is aligned to the latest NCERT syllabus and mapped to the exact chapters your school follows, so you can revise in the same order you are taught. Across 13 chapters we have 1,172 practice questions covering all three difficulty levels — Easy to build confidence, Medium to consolidate, and Hard to stretch you toward competitive-exam command in the senior-secondary years.

Class 12 Biology rewards diagram-based recall, terminology and NCERT line-by-line accuracy. Each chapter on XamBaaz gives you three separately timed quizzes (Easy, Medium, Hard) with exam-grade marking — +2 for a correct answer, −1 for a wrong one and 0 for a skip — the same negative-marking discipline used in CBSE Board exams and NEET UG. Every question comes with a one-line explanation, so you learn the reasoning behind the answer instead of just memorising the option.

You can start anywhere. Popular starting points include Sexual Reproduction in Flowering Plants, Human Reproduction, Reproductive Health, all the way through to Biodiversity and Conservation. Work chapter by chapter, watch your accuracy climb on each one, and once you have attempted every chapter the Class 12 Biology Subject Mastery Test unlocks — a 30-question, 60-minute cross-syllabus mock that mirrors a real NEET UG paper.

Practice is completely free to try — no credit card, no app to install. Sign in with Google and your progress, streaks and XP save automatically across every device, so you can revise Class 12 Biology on your phone between classes and pick up exactly where you left off.

Each chapter opens with free Key Concepts revision notes — a quick overview, the core concepts defined and key formulas — so you can revise Class 12 Biology before you practise. Open any chapter below to read its notes and try sample questions.