Admission to the course at U.G. level after +2 is through the AIEEE (All India Engineering Entrance Examination) conducted by CBSE, (Central Board of Secondary Education) New Delhi. Details on the examination and counselling procedure can be availed from http://cbse.nic.in.
The AIEEE is a competitive examination written by over lakhs of students every year aiming to gain admission into the prestigious NITs around the country and other deemed universities registered under the AIEEE counselling scheme.
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*NRIs / DASA candidates can get more information from the above link.