Hello Aspirant,

See if you want to get B.Tech. course into IIST then you have to appear for JEE-Advance and should have secured the minimum cut-off marks to be eligible for admission to any institution even in IIST through JEE-Advance score. But note that just qualifying the cut-off marks does not ensure your admission in any institution because admission are based on ranks allotted to each candidate on the basis of his/her marks scored in JEE-Advance.

For detailed process for admission in IIST kindly check out the link given below :-

https://www.careers360.com/university/indian-institute-of-space-science-and-technology-thiruvananthapuram/admission

I hope this information helps you.

Good Luck!!