These are some of the books that you can refer for your own course to excel well in the IIT JAM exams. About life sciences, alomg with Pranav Kumar I'll suggest you to follow Usha Mina book too. It has great concepts covered as well..

.Life Sciences: Fundamentals and Practice – I, II: -Pranav Kumar, Usha Mina

.Principles of Genetics: -Gardner, Simmons, Snustad

.Cell and Molecular Biology: - Karp

.Biochemistry: -Jeremy M. Berg, Lubert Stryer, John L. Tymoczko

.Developmental Biology: - Scott F. Gilbert, Susan R. Singer

.Kuby Immunology: - Barbara A. Osborne, Richard Goldsby

.Essentials of Physiology: - Lauralee Sherwood

.Molecular Biology of the Cell: -Bruce Alberts

.Microbiology: -John P. Harley, Donald Klein.

Best wishes. Thank you.