I get 84 marks in physics 71 in maths and 58 in chemistry in 12th then can i apply IIST

As per 2017 information, all aspirants must have secured at least 75% aggregate marks in Class XII (or equivalent) board examination. SC, ST and PD candidates must have obtained at least 65% aggregate marks in class XII in order to be considered eligible for IIST B.Tech admission 2017.

To know more about the same, you can go through the below article -

IIST Eligibility

Hope this helps!!!

In order to apply for IIST you must have secured at least 75% aggregate marks in Class XII (or equivalent) board examination. SC, ST and PD candidates must have obtained at least 65% aggregate marks in class XII in order to be considered eligible for IIST B.Tech admission.

You can also check the details from the given below link

IIST Eligibility Criteria

Good Luck!!