First, complete your NCERT book to build a strong base.
Biology- Most of the questions are covered from NCERT only. So, complete your NCERT book and do proper revision. You can also prepare footnotes carrying important keywords.
Physics and Chemistry- You must clarify your concepts and keep the basics clear. you can allot three week's time for the same and revise the concepts in the remaining days of the month by solving sample papers and taking mock tests. For Physics, you should keep a formula sheet handy, for Chemistry, a sheet of equations should be ready.
Solve previous year questions papers this will help in understanding the distribution of marks among the subjects.
Take mock test as much you can! It is the most important and useful way to judge your preparation.
**Here is the list of books which you can follow besides NCERT **
**Physics: **
* CBSE PMT by P. Aggarwal (set of 3 Volumes)
* HC Verma (Volume 2)
**Biology: **
* Pradeep's
* Trueman's Biology (Volume 1 and 2)
* AC Dutta for Botany (Oxford Publication)
* MTG (Biology Today) CBSE PMT (magazine)
**Chemistry: **
* ABC Chemistry
* Organic Chemistry: Arihant Publications, Morrison Boyd
* Physical Chemistry: Peter Atkins and Julio de Paul
* A New Pattern Textbook of Inorganic Chemistry for Competitions by O P Tandon
* Objective NCERT at your fingertips Chemistry by MTG
ALL THE BEST!!