Hi,

Yes, the eligibility criteria for IIT JAM is to pass the graduation with 55% marks(5% relaxation in terms of reserve category) or 5.5( 5 CGPA for reserved category) CGPA on the scale of 10. If your pursuing B.SC in Forensic Science or Microbiology, you will still be eligible for IIT JAM, however, the course you will get into after qualifying IIT JAM may vary. So, as per the specializations offered under the IIT JAM, with B.SC Forensic Science/Microbiology, you will be eligible only for M.SC in Biotechnology.

You can check out the courses offered under IIT JAM , and various Bachelors degree considered as eligible for a particular course over here: https://university.careers360.com/articles/jam-eligibility-criteria

IIT JAM preparation tips, exam pattern: https://university.careers360.com/exams/jam