Hi

Only your class 12th results are considered for checking eligibility.

Now you have got 7.7 CGPA in 12th i.e 7.7 *9.5= 73.12 %.

So, with your 12th  score you are eligible for NIT only if you belong to SC/ ST category as to be eligible for NITs one needs at least  75% marks in  class 12 if belong to general or obc category or at least  65% marks if belongs to SC/ST.

For detailed information go through

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Thank you