Undoutedbly, NCERT Textbooks or State Board Textbooks are best for basic preparation and concept clarification. If you are asking about Jee Mains or any other engineering entrance exams, then you can go for H C Verma for Physics, Fundamentals of Physics by Halliday, Resnick & walker, Problems in physics by SS Krotov for practicing problems. Modern Approach to Chemical Calculations by R.C. Mukherjee for For practice of solving Physical Chemistry Numericals, Organic Chemistry by O P Tandon, Concept of Physical Chemistry by P Bahadur. For Mathematics, Objective Mathematics by R D Sharma, Plane Trigonometry by S L Loney, Integral Calculus by Amit M Agarwal (Arihant Publications).
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