Must have secured at least 75% aggregate marks in the Class XII (or equivalent) Board examination. The aggregate marks for SC, ST and PD candidates should be at least 65%.

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Candidates who are seeking admission in any Btech programme must meet the eligibility of IIST 2018 Btech. Candidates belonging to general category must secure 75%aggregate marks in (10+2 or equivalent) and those who belong to SC/St category must score 65%aggregate marks.

Visit this link about IIST 

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