Hii Himanshu

The admissions in Indian Institute of Space Science and Technology is totally based on JEE Advanced Scores. So for that first you have to clear JEE Mains then only you will be able to give JEE Advanced. Registration for IIST B-tech Admissions 2019 will be open from May 22, 2019 in online mode. The official brochure will be released on May 7, 2019 by IIST. You will have to fill the form of IIST by providing all the details about their JEE Advanced. Allotment will be done on the basis of rank list, selected preferences , availability of seats. The total procedure is online process.

For more details regarding IIST B-tech Admissions 2019 click on the link.

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

With Regards

Best of Luck

Hello.

Admission to IIST is through the your Jee Advanced ranking and your Jee mains score will not have a role in admission.

Hope this helps.

Hello Himanshu,

I would like to tell you that admission in BTech programmes are offered at IIST on the basis of your performance in JEE Main and JEE Advanced examinations. 

There are some other eligibilty criteria like you should have secured minimum 75% aggregate marks in your Class 12 Board exams or equivalent examination.

Hope this helps and all the very best!