Hello Aspirant, 

If you belongs to General category, then it's hard for you to get a seat.

However, some of the Institutes also admit students based on the candidate’s obtained merit at the 10+2 level, while the some others conduct their own entrance tests for offering the admission. Admission process generally varies across colleges.

Students should have Senior Secondary (10+2) qualification, in the Science stream, completed from a recognized educational Board.

A minimum aggregate score of 50% (45% for SC/ST/OBC candidates) at the 10+2 level.

Physics, Chemistry, Math/ Biology as the main subjects of study at the 10+2 level.

Hope this will helps you. 

Thank you.