Dear aspirant !

Hope you are doing great ! Your class 12th marks doesn't matter for getting admission into any nit or iit ,you need to give jee mains 2022 which will held in June and July , application form for June attempt has ended but you can try second one ,for it the application form will release soon ,on the basis of your marks in jee mains you get college like nit /iiit but for iit ,you need to qualify jee advanced which is tough than jee mains , students who qualify jee mains are eligible for jee advanced . So you can also do your preparation according to your preference.

For more about jee ,visit the link;-

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-2022/amp&ved=2ahUKEwjf4K6O9IT3AhXj4nMBHZSDDNYQFnoECAQQBQ&usg=AOvVaw0MK_nHUuH-7yTGxus_3sLb .

Hope it helps you !

Thanking you