As per me There is no entrance test conducted by Indian Institute Of Space Science And Technology (IIST) for its B.Tech program admission , there are admissions will be done through JEE Advanced:

IIST B.Tech key Dates

Event


Date

Online registration begins


June 1, 2017

Last date for online registration


June 15, 2017

Last date for remitting registration fee online through SBI-Collect


June 16, 2017

Publication of IIST Admission Rank list and details of the Admission Counselling date/venue


June 21, 2017

Counselling of IIST B.Tech 2017

Admission criteria :
Students should have obtained at least 75% marks in aggregate in Class XII (or equivalent) board examination.

For SC, ST and PD Students, the eligibility criteria in class 12th is at least 65% in aggregate