Dear Anas, Biology section has 90 MCQs. Every right answer gets you 4 points and 1 wrong answer takes away 1 mark. So to score 345, you cannot afford any negative marking. You should get atleast 87 questions right which means you can afford to skip answering 3 questions. I'll repeat, you can only afford to skip answering 3 questions but cannot afford to write even a single wrong answer. NTA depends largely on NCERT books. But there are also other NEET oriented books in the market that can help you:

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

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