Hello Shrey Patel, Jee exam is of two levels, both jee mains and jee advanced, the basic stage is jee mains and when you clear the jee mains level, you get to write jee advanced, only with jee mains, you can get a seat in NIT's, with both jee mains and jee advanced you can get a seat in IIT's and top institutes considering the score of jee mains or advanced.

You can check further at https://engineering.careers360.com/articles/jee-main-cutoff .

This link has more details about cutoffs.

Hope this helps.

Thank you.