Hello, hope you are doing well
As many students think that class 12 is hard, but if their  class 11 basics are clear, they don't have to face any problems. The topics you had studied in Class 11 build the foundation for advanced chapters in Class 12, especially for students preparing for NEET , CUET or other entrance exams. Class 11 is more about understanding concepts, while Class 12 applies those concepts in detail.
Some of the most important Class 11 chapters that form the base for Class 12 Biology are:
1. Cell: The Unit of Life – This is a key chapter that helps you understand how cells work. In Class 12, you study Cell Cycle and Cell Division, these chapters come up again when you study .
2. Biomolecules – This chapter explains the basic chemical molecules like carbohydrates, proteins, enzymes, etc., which you will see some questions in NEET directly based on Molecular Biology and Biotechnology.
3. Plant Physiology – Topics like Photosynthesis and Respiration in Plants are very important, and if you go deeper into the same topic like plant growth, hormones, and reproduction they have some similarities.
4. Human Physiology – This unit includes chapters on digestion, respiration, excretion, circulation, nervous control, and locomotion. These directly help in understanding topics like Human Reproduction, Reproductive Health, and the Nervous System.
5. Structural Organisation in Animals and Plants – This builds the base for chapters like Organisms and Populations, Evolution, and Biotechnology.
6. Diversity of Living Organisms – Although this is more factual, it helps in understanding taxonomy and classification in chapters.
The NCERT Biology textbook is considered the most reliable source for concept clarity and exam preparation for both boards as well as entrance level also. But if you're studying from a state board that does not follow NCERT directly, it's important to visit your state board’s official website or refer to your syllabus to check the exact chapter flow and topic coverage. Some state boards align closely with NCERT, while others have their own structure.If you're entering Class 12, it’s a good idea to revise important Class 11 topics again especially if you want to do well in school boards and competitive exams
Thank you,