Hi , 

So most of the major Btech admissions are through JEE examination and state level entrance examinations . Yet there are many engineering colleges which accept students based on 12 th marks . 

https://engineering.careers360.com/articles/btech-admissions-on-basis-of-class-12th

Check out this link for detailed information.  In case of further queries please approach careers360.  

There are no good colleges which consider the 12th marks for admission in B.Tech in India. To get a good college you must have to take JEE exam or if your state has some technical exam like UPSEE for Uttar Pradesh, WBJEE for West Bengal, etc or some good private colleges also have their own exam like SRM, VIT, BITS, etc.

There are certain private colleges which can give you admission on the basis of 12th marks but the quality of education is not good enough in these colleges.