Hello Aspirant,

See for admission to B.Tech courses offered by NITs does not require any kind of gap certificate and the seats are allotted through JOSAA counselling so after getting seat allotted you have to carry the following documents to the reporting center for NITs/IIITs/GFTIs :-

• Three Passport Size Photographs identical to the one Uploaded in JEE Main 2021 Registration
• Provisional Seat Allotment Letter
• Candidate Undertaking
• Proof of Fee Payment by e-challan or Internet Banking of SBI for Seat Acceptance (Rs. 15, 000 for SC/ST/PwD candidates and Rs. 35,000 for others)
• JEE Main 2021 Score Card
• JEE Main 2021 Admit Card
• 10th Standard Mark Sheet or Date of Birth Proof
• 12th Standard (or equivalent) Mark Sheet and Pass Certificate
• Photo Identity Card
• Medical Certificate
• Category Certificate (if applicable)
• PwD Certificate (if applicable)
• OCI Certificate or PIO Card (if applicable)
• Print out of Filled Choices for Seat Allotment

As the JEE-Main 2021 result is out so you can use JEE-Main College Predictor to predict your chances of admission in different engineering colleges of India on the basis of your JEE-Main 2021 result :-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!