Alok, Arihant alone might not be sufficient enough. You have to try the following books too:

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

Now if your goal is 340-350 out of 360, then you cannot afford any negative marking. Do not answer when in doubt because you will lose marks in negative marking. 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.

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