Through JoSAA after 6 rounds you will need to register for the CSAB counselling, with the rank of 42911 it is difficult to get any top tier nit or iiit like surathkal etc, but you have chances for newer, lower to middle level nit's and iit's in courses like civil, mechanical, etc.

Based on your JEE Main 2025 results (62 percentile, SC category rank 42911) after JoSAA Round 6 you meet the SC qualifying percentile of 61.1526933. You're eligible for CSAB Special Rounds.

Your rank makes securing top branches like CSE/ECE in premier NITs/IIITs challenging. SC cutoffs for these usually fall within 1,000-12,000 rank range.

Explore less popular branches (Civil, Mechanical, Metallurgy) or newer/lower-ranked NITs (like NIT Puducherry, NIT Mizoram). Home State quota can significantly improve your chances.

Good luck!!