Hello dear student! 

Greetings! 

IIST B.Tech admission 2019 was on the basis of JEE Advanced 2019 exam. So class 12th marks doesn't play a big role , you just need to get at least  75 % in class 12th to be eligible .

Candidates can refer to the cutoff of IIST B.Tech admission for past five years as given below in the link :-

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

thankyou 

Hi candidate! For admission in indian institute of space science and technology, thiruvananthapuram one has to have science in class 12. One have to pass the board exam having a minimum of 75% in the science subjects. One has to also qualify in both jee mains and jee advanced exam to get admission in this college. For more information write down in the comment section below. Hope this helps.

Thank You!