Dear Mohan, Biology has the highest no.of questions and you have chance to score good there. We have prepared a strategy for Biology section after inputs from yhe Toppers and our experts. This might help you:
Syllabus for Biology includes:

Diversity in Living world
Structural Organization in Animal and Plants
Cell Structure and Function
Plant Physiology
Human Physiology
Reproduction
Genetics and Evolution
Biology and Human Welfare
Biotechnology and its applications
Ecology and Environment

Biology Best Books:

NCERT Biology Class XI and Class XII textbooks
Biology Vol 1 and Vol 2 by Trueman
Objective Biology by Dinesh
Objective Botany by Ansari
Pradeep Guide on Biology
GR Bathla publications for Biology

Preparation tips:

Biology is the biggest section in NEET, comprising about half of the exam, and acing this subject can help you in scoring more in the exam. Human Physiology and Genetics have maximum weightage in NEET. It is advisable to practise questions of Genetics from previous year question papers, which will give you a thorough understanding of how the questions are being asked. Topics of Plant and Animal kingdom have a lot of portion to memorize. You can prepare these topics by making a comparative table for the sub-topics and studying it together. Plant physiology is also equally important and easy to score. For more tips, please visit our page at:
https://medicine.careers360.com/articles/how-prepare-for-neet-biology