My rank is 70,000 in obc category . Please tell me in which college should I try to get admission in B.tech CS stream.
You haven't mentioned the state you belong to. You can get many good private colleges with this rank. Getting CSE may be a little difficult with this rank. I would suggest you to apply for some state counseling.
You can use our college predictor to predict the best college for you:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
Hope this answer helps you.
Good luck!!