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IIT JAM is a national level exam that is conducted to shortlist students for admission to MSc and integrated MSc courses offered by colleges accepting IIT JAM scores for admission. IIT JAM is jointly conducted by the IITs and Indian Institute of Science (IISC). The IIT JAM Exam serves as a benchmark for the post-graduate level science education in the country. the main objective of the exam is to provide the best opportunities for students to develop academic talent leading to a challenging and rewarding professional life in them.

There are some best books to prepare:

1. Statistical Physics - Reif
2. Heat & Thermodynamics - H.P. Roy & A.B. Gupta
3. Thermal Physics - Garg, Bansal & Ghosh
4. Thermodynamics Kinetic Theory and Statistical Thermodynamics - FW Sears, G.L. Salinger
5. Thermal Physics: Heat & Thermodynamics - HP Roy & AB Gupta
6. Fundamentals of Statistical Mechanics & Thermal Physics - F Reif

Steps to prepare:-

1. Refer Past Years' Question Papers.
2. Solve at least 10-20 Physics questions daily.
3. Know the Exam Pattern for IIT JAM.
4. Try to Solve all solved and unsolved numerical. Be thorough with numerical and formulae. In thermodynamics, it is necessary to understand the dedication of formulae.
5. Strengthen your mathematical skills - Physics questions require a great understanding of Mathematics and its terms.
6. Video lectures & visual study techniques are great tools promoting conceptual learning.
7. You must also practice the JAM Physics mock test, previous year question papers and sample papers to level up the preparation.

For more details you can go to the link Below:

https://university.careers360.com/exams/jam

All the best!

Hope it will help!

Thank you!