Hello Applicant!!

As per the admission into IITs, NITs or BITS is concerned it is governed by their entrance exam performance and to appear for the exam you need to have at least 50% aggregate. Hence even if you have some poor or bad record of performance then also you can use up your final performance in the entrance exam to score well. And unless you have uncleared backlogs, your performance or admission criteria will not be hampered in any Institution.

Hope it helps!!!