Hello

Inorder to study for Btech in IIST Trivandrum, you can to qualify JEE advanced.

General category students must score atleast 20% marks in JEE advanced,that is 72 marks out of 360 with atleast 6 marks out of 120 in each of the three subject.

Also you have to pass higher secondary exam with atleast 75% aggregate marks.

You can chek the detailed eligibility criteria using the link below

https://engineering.careers360.com/articles/iist-btech-admission

Inorder to get admission for MTEch you have to qualify GATE exam.

https://engineering.careers360.com/articles/iist-mtech-cutoff

You can check gate cutoffs using the link above

Hope it helped you

Thank you!!