As you have not specified the board from which you have done your class 12 i am considering it to be CBSE. According to the eligibility criteria set up by IISER , for SCB

The cut-off percentage for class 12 set by the board must be obtained in order to be eligible. The cut off for CBSE is around 88%. As you have only 80% you are not eligible. If you any other board, please writr in comment section