Hey!

For be eligible for IIST, you need to qualify JEE Main and sit for JEE Advance. They don't have an entrance exam of their own. The shortlisting is done on the basis of JEE Advanced score. The cutoffs keep changing according to the no. of students and their performance. Analyzing previous year data, you may qualify with 10% of total marks in JEE Advanced and you must have a minimum of 2.5% in PCM each.

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

Hello Rohit Kamble

Candidates must obtain at least a 75 percent overall score on the class 12 board exam or its equivalent. Candidates who fall under the SC, ST, or PWD categories must have obtained an overall board test score of at least 65 percent.

I hope this answers your question.

Thanks