Hello, following are the best institutions:

Maharishi Dayanand University (MDU)

Techno India University.

English and Foreign Languages University (EFLU).

IIT-Madras.

Admission procedures vary with college, but in general you:

Apply to the course.

Take an admission exam if there's one.

Obtain your scores, add your board scores and see if you meet the cutoff.

Then turn up for counselling and admission.