Through JEE MAINS score you can take admission in any of the BTech courses offered by the college you aspire to take admission in. Some of the top trades which you can take admission in, on the basis of JEE MAINS:

• B.Tech Civil Engineering.
• B.Tech Computer Science and Technology.
• B.Tech Electrical Engineering.
• B.Tech Information Technology.
• B.Tech Mechanical Engineering.
• B.Tech Electronics and Telecommunication Engineering.
• B.Tech Aerospace Engineering.

There are also other courses like Biomedical Engineering, Genetical Engineering etc which are offered through JEE MAINS score. The point is, all colleges don't offer all the branches. Each college have there own departments, so the course you want to study, you have to search for the colleges which offers the course. You can consider the link below, to find out the name of the colleges accepting JEE MAINS score as well as the courses offered by them-

https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-india-accepting-jee-main

I hope this helps. Wish you a great eve!