Hello there,

Best book for the preparation for JAM Physics are-

• Mathematical Models for Physics and Engineering  by Riley , Hobson and Bence
• Thermodynamics by Zemanski Dittman, Saha Srivastava/ F.W. Sears and G.L. Salinger
• Molecular and Atomic Physics by Rajkumar / white
• Classical Mechanics by Herbert Goldstein
• Classical Mechanics by John. R. Taylor.

For more details you can go through the below link https://university.careers360.com/articles/how-prepare-for-jam

Good luck!!