i got 6240(gen),930(obc) rank in iit2010.and 6709(gen),927(obc)in aieee.which one is better to prefer?

Dear krishna

I think you can get chemical,chemical science,civil in IIT guwahati under obc category

and you will also get computer science ,electrical ,mechanical in new IIts .This will be the best option for you.

Please feel free to post as many doubts on our discussion forum as you can.
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Regards,
Askiitians Experts
Badiuddin