Dear candidate, you need to give exams like JEE Mains, BITSAT, State Engineering Exams, entrance exams of Private colleges if you want to do Btech(Computer Science). JEE Mains is for National Institute of Technology(NIT), BITSAT is for BITS, after clearing JEE Mains students give JEE Advanced to get admission in Indian Institute of Technology(IIT). In private colleges: VITEEE is for VIT, SRMJEE for SRM, MET is for Manipal colleges, etc. It’s course is same of class 11th-12th Physics, Chemistry, Maths with level of questions a bit higher(competitive type). For more information, check out this link:

https://engineering.careers360.com/exams/jee-main

https://www.careers360.com/exams/bitsat

Hope, it helps!