Hello Gaurav,

If you are dealing with PCB, then you must keep habbit of reading state board text books periodically and simultaneously get on with NCERT text books for NEET Preparations. The chemical equations should be practiced daily corresponding with the theory. Start preparing your own short notes. Even go through the previous years question papers. Physics is a subject that should be an everyday routine. Its little tough for Bio students unless you are keen interested in the subject. Those numericals, derivations and theorems must be on hand. Let me tell you being myself Medical Biologist Maths is very important subject which now-a-days Bio students don't take into consideration. 3months could be managed if you give quality time. Biology textbooks should be read and understand. Preparing self notes and solving question papers will help  you a lot. 

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BEST WISHES!

• Make your own schedule which should include how many hours to study, how many chapters,subject should be get completed in a month/week.
• Studying 3  to 4 hours is not at all going to help you.You should nearly spend 6 to 7 hours a day
• Don't go for only 1 subject for longer time. Either change it or rest your mind
• Test your knowledge you have gained on weekends
• Try to solve each question in various ways
• Morning studies are more beneficial.
• Never go for night studies.
• Concentrate on what you are doing.concentrate