Engineering Entrance Exam

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Yes, GATE is quite important exam as a good score not only ensures your admission in IITs but also gives you a chance to get into PSUs.

No, you won't get CSE in Heritage. Try for other branches.

I guess 70% is good enough to GET admission in some good private engineering colleges. It would be a waste of time to give improvement in 12th and it's not even known that the aggregate would improve or not. If you give improvement, it would take another year, which is why it's better to try out some other engineering colleges.

My score : 208,AIR-12381,OBC NCL-3404

Since the cutoff of CSE branch is more than other branches so to get it in NIT is not possible but you could take any other branches to get into NITs and if you'll work hard in first year then you'll definitely be upgraded to higher branches like CSE based on your performance.