Hello Habibul Islam,

Cheers for having interest in IIST.IIST,Thiruvananthapuram offers Btech 4 years courses in Aerospace Engineering,Electronics & Communications Engineering.And 5 years Dual Degree course in Master of Science/Technology.Their admission process is based on JEE Advanced score.For that first you have to qualify JEE Mains.Then you have to clear minimum criteria in JEE Advanced.Minimum criteria is :

• Other Backward Community – Non Creamy Layer (OBC-NCL) Candidates: At least 18% marks in aggregate and at least 4.5% marks in each of the three subjects (Physics, Chemistry and Mathematics)
• Scheduled Caste(SC), Scheduled Tribe(ST) & Persons with Disabilities(PD) Candidates: At least 10% marks in aggregate and at least 2.5% marks in each of the three subjects (Physics, Chemistry and Mathematics).

Then you have to apply in their website.After that they will publish a merit list based on marks of all the applied students.They have reservations as well.

For more information on their admission procedure,check out the following link:

https://www.iist.ac.in/admissions/undergraduate