Which colleges admit students of 3 Lacs rank in B.Tech?

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At this rank, getting a government college seems impossible but yes, you can get admission in private colleges like AKG, ABES, Poornima, etc.

I would say None good colleges. Some private colleges may give admission. But I am sure no government or even reputed colleges will give admission with such a low rank. You can try for private colleges which are conducting their own exams. VIT, KIIT, SRM and all others. You can have a try.