I have a few friends from JIPMER and these are the books that they suggested for the entrance exam.
Microbiology:
Pathology:
Forensic Medicin and Toxicology:
Internal Medicin:
Obstetrics & Gynaecology:
Anatomy, Biochemistry, and Physiology:
Other subjects:
There are many solved question and answer books of JIPMER entrance of previous years available. Go through one of them to get an idea of the examination pattern.