Do I need to score 75% in PCM or aggregate for taking JEE Mains exam?

After attempting JEE mains, you can pursue the course what do you want and attending JEE counselling, you may get college based on your arrangement of order in counselling 

I think there is something wrong with your, choice filling order you from obc ncl still you are not getting that NIT how is it possible with this rank . Participate in CSAB Special Round you will definitely get a very good seat.

IIIT Surat JEE Main cutoff 2025 has been released for the fourth round. As per the round 4 cutoff list, the closing ranks varied between 24479 and 33703 for candidates belonging to the General AI category. As per the cutoff range, 20,000 seemed to be a good rank for candidates belonging to the General AI category. With this rank, candidate can get admission to almost all the branches for which the cutoff has been released. 

Tezpur University has released its B.Arch., BTech and BTech Integrated courses for the All India quotas. For All India, BTech cutoffs were released by the university. Considering the Tezpur University JEE Main cutoff 2025 for the Round 4 seat allotment results, yes, candidates scoring a rank of 50000 can get admission into the university. Candidates can even fetch BTech in CSE programme with this much of rank. The BTech in Computer Science Engineering cutoff stood at,  60587 for the General All India quota candidates.