Hello Ravi,
Of course, you can. Upon qualifying JAM you can pursue your master's degree in science from either an IIT or an NIT.
Yes, a graduate from B.sc can apply for IIT JAM Examination. All you need is 55% aggregate (General/OBC) and 50% aggregate for SC/ST/PWD in your graduation.
There are also some other eligibility criteria which should be known by every candidate before applying for IIT JAM.
Good luck!
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