Hey there
At 42500 rank your chances of getting CSE at most of the NITs, IIITs, GFTIs are low. you have to look for other colleges or you can sit for spot rounds too you may get lower NITs or IIITs with lower branches.
check our college predictor
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
good luck
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