I can get admission on the basis of jee mains in NIT?

In nit only admission is possible through jee

Hi dear
To take admission in top colleges of engineering you should have to crack JEE Main Exam. Through JEE Main you can take admission in NITs/IIITs and GFTIs. There are many top private colleges who consider JEE Main marks to provide admission.
You can check the colleges below-
PSG College of Technology, Coimbatore
SSN College of Engineering, Kalavakkam
Thapar University, Patiala
Bharati Vidyapeeth Deemed University College of Engineering, Pune
Birla Institute of Technology, Mesra
Apart, from JEE you can also give below private level entrance exam as they provide very good placements.

Depends on your jee mains mark.