JEE

The admissions in IIST are based on the ranks secured in JEE Advanced. So JEE Main scores are not enough. So you can get admission here if performing well in JEE Advanced. The eligibility criteria of IIST for B.Tech Aerospace Engineering is given below:
Eligibility : Keeping in mind the pandemic situation prevailing in the country, IIST UG Admission 2021 has relaxed the admission criterion. In line with the decision taken by the Central Seat Allocation Board and the IITs, candidates are now required to only qualify in 10+2 or equivalent examinations. This modification is done for the year 2021 only.
Admission criteria : Candidates should have appeared for the Joint Entrance Examination (Main)-2021 conducted by National Testing Agency (NTA), to qualify themselves to appear for the Joint Entrance
Examination (Advanced)- 2021 conducted by IITs and secure the minimum prescribed marks as given below:
For general candidates : At least 16% marks in aggregate and at least 4% marks in each of the three subjects (Physics, Chemistry and Mathematics)
Further admission in IIST not done through the JOSSA, you have to register through admission.list.ac.in for getting admission here.