I am a BSc final year student in physics.Am I eligible for IIT-JAM 2018?

As there is no such chances in IIT JAM 2018 eligibility, so you can consider the below given one for 2017 -


The JAM 2017 appearing candidates should have secured at least 55% marks in aggregate of the subjects including languages and subsidiaries of all the years combined. Those however belonging to SC/ST and PwD categories need to secure at least 50% marks in aggregate of the subjects.
Candidates need to note that the equivalence of marks in case of grades in letter/CGPA (and not in percentage of marks) will be decided by the JAM 2017 participating institutes.
As per the eligibility criteria of JAM 2017, candidates will need to submit their proof of qualifying the degree examinations by September 30, 2017 to the admitting institute, failing to do so will lead to cancellation of candidature.

For more detailed information, you can go through the below article -

JAM Eligibility Criteria 2017

Hope this helps!!!!