Hello student you need not to fill any separate form apart from Jee main to get admission in NIT kurushetra after Jee main July you'll get your rank and you need to register yourself for Jossa counselling and on the basis of rank you obtained you'll get colleges accordingly.

Eligibility - Candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board

For more updates refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/josaa-counselling/amp

Feel free to comment if you have any doubt

Good luck