I got 76. 5% in jee main exam i will try to join nit or not?

Hello Vishnu,
For clearing jee more than 85 percentile is required to clear the Jee main.

For getting NIT candidate require more than this percentile .

You should work smart and try to solve previous year question from question bank of Arihant to get good percentile.

You can score good with little more effort for April Jee.
After April Jee best of both Jee exam will be consider for the taking admission.
If you have any questions remain than comment below.
Good luck.