Hello apspirant,

As you have not specified the subject your are keen to know its best books. I am providing you with the best books of all three core subjects.

FOR PHYSICS

• Concepts of physics (Vol. 1 and 2)  by H.C Verma
• Fundamental of physics by Halliday, Resnick & Walker
• Understanding Physics: Set of books for

  • Electricity & Magnetism

  • Mechanics (Vol. 1 & 2)

  • Optics & Modern Physics

  • Waves & Thermodynamics by DC Pandey

• Problems in General Physics  by I.E Irodov
  
  FOR CHEMISTRY

  Recommended

• Modern Approach to Chemical Calculations  BY R.C Mukherjee

• Organic Chemistry by O P Tandon

• Concept of Physical Chemistry by P Bahadur

• Concise Inorganic Chemistry  by J D Lee
  
  
  FOR MATHEMATICS

• Objective Mathematics  by R D Sharma

• The Elements Of Coordinate Geometry  by S N Loney

• Plane Trigonometry  by S N Loney

• Differential Calculus  by Amit M Aggrawal

Algebra  by Dr. SK Goyal

Apart from these practice books, a student should first focus on the NCERT Books before jumping to these practice books. Clearing basic is the key to crack any exam.

Good Luck.