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Yes you can do that but only for NITs by reappearing for JEE Main 2021, perhaps if you are absolutely not satisfied with the branch you are studying or the culture which is so contrary to the campus culture at IITs we know. But, I believe you wont get the correct atmosphere or motivation to prepare for JEE Mains all over again and I would perhaps advise you, since its your first year work hard and try for a Department Change.
Even if you are not able to get a DepC, as we normally name it, its just fine. Try developing new skiils and mastering them over the course of your degree, like Software, Finance, Analytics and Consulting, discuss and connect with Alumini and Seniors of your branch and make sure you keep up with College academics. Trust me, the exposure and opportunities an IIT can give you, no other Technical Institute in India can provide a similar environment and campus culture.
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