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Dear aspirant, Glad to meet you. Generally for most of the university the criterion is you should have minimum of 65% marks in overall and in mathematics and in PCM is required to take admission in B.Tech degree course. For reserved candidates the percentage varies from 50% to 65% according to the university. If you have very low percentage and you are worrying about admission in B.Tech then contact with the institution where you want to take admission or contact in the university under which you want to take admission they will provide you the exact criterion for taking admission in B.Tech according to that particular university under which the college is approved.

Hi Soumya, I understand you're quite worried about your admission and placements at the time, but I would also recommend you to not to repeat class 12th as it will only waste your year.
If you're seriously interested in pursuing B.Tech or Engineering then you should opt for a college that accepts 50% marks as their eligibility and then work extremely hard for good grades.
If you'll do exceptionally well in your graduation then nobody will even notice your class 12th percentage.
As then your graduation percentage will only matter more. So trust me if you're willing to work hard and study more then don't repeat class again.
I've heard of University of Technology and Management, (The branch of MIT Pune) where the eligibility is 50% and above marks, you can try for admission there once.
Here'a a link for your reference- www.utm.ac.in