Hello Alok

The Joint Admission Test (JAM) is conducted for admissions into MSc and related postgraduate science programmes. 
You need to prepare a well-planned strategy to perform well in the exam.  
To start your preparation, you should know about the detailed syllabus and exam pattern. 
Make a proper timetable and follow it religiously. Refer the best books and also previous year question papers and sample papers to have an idea about the types of questions asked in the exam.

For Physics, you must keep your concepts clear and should have a strong understanding of the topics. If your basics will be clear, you would be able to solve theoretical and numerical problems easily.

Go through the link below and check the detailed preparation tips for JAM Physics

 https://university.careers360.com/articles/how-prepare-jam-physics

Good luck!

Hello,

Here is the name of the some best books;

1. Quantum Mechanics - By Zetili / Griffith / Schaums Series

2. Solid State Physics - By Kittel / M A Omar / S O Pillai

3. Statistical Physics - By Reif

4. Mathematical Physics - By Riley, Hobson and Bence  /Arfken Weber

5. Classical Mechanics - By Goldstein / J. R. Taylor / David Morin (J C Upadhyaya can be referred to )

6. Thermodynamics - By Zeemansky / F. W. Sears and G. L. Salinger

7. Optics - By Ghatak / Brijlal and Subhramanyam

8. Electrodynamics - By Griffith

9. Semiconductor and Electronics - By Boylested /Gaekwad

10. Nuclear Physics - By Irwin / Devnathan

11. Molecular and Atomic Physics - By Rajkumar

Hope this will help you. All the best.