Dear candidate, though it's much late but here's the elegibilty criteria for the exam:

https://it.careers360.com/articles/nimcet-eligibility-criteria

The basic NIMCET eligibility criteria requires Indian candidates to be graduates in S cience/ IT/ CA/ Technology or Engineering, with at least 60% marks or 6.5 CGPA. Only eligible candidates will be able to apply for this national level exam which is the gateway to admission into M.C.A. courses in the 10 participating NITs.

According to 2020 rules, a finap year student can give exam if he/she graduates not later than September 2020.

Candidates in the last year of their Bachelor’s programme are also eligible to apply for NIMCET 2020 . However, such candidates must provide their proof of passing latest by September 15, 2020.

Hope this helps. Good luck!