Hello Neeraj,
Yes sure you can secure admission in top IITs or NITs. There are two kind of admission in IITs or NITs one is on basis of GATE Rank. In this case, for top rankers they take direct admission. After that, they call for GD PI and other academic record checking for admission of low rank students. But for this too, you rank must be good. Don't worry about grades, do focus on GATE.
Good Luck.

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