Hello aspirant,

The only entrance exam for b.tech is jee mains, or you can get seat from management quota (if that college allowed you).

Also for free seat you will have to gain good marks in jee mains, so that you can get the seat in good nit , IIT or state government college.

So the only key of getting the seat free of cost for b.tech is to gain good marks in jee mains.

Hope this helps you

Feel free to ask any questions

All the best for your future