math and computing colleges

im in 12th grade, giving boards next month. want to do btech in mnc; currently aiming for bitsat. since its a relatively new branch, there arent a lot of options, so i wanted to know what the best options would be for mnc. (started mains prep very late, 11th syllabus incomplete, doing mains pyqs practice for 12th topics, so iit/nit very unlikely)