Hi, For UG Admissions:
To study in a good institute it is important to give Btech competitive exams like JEE MAIN, BIT SAT, SRM, VIT etc.

For PG Admissions:
Based on your interest, you can apply in GATE for Mtech studies.
You can get into PSU's further to get good placements.

To know more about GATE, you will have to check here in detail: GATE-All about!

Good Luck!