Hii,

If you want to get admission in IIST then you must score above average in Advanced and if you belong to a general category then do keep in mind that you'll have to get at least t 20% marks in aggregate and at least 5% marks in each subject. It also depends upon the number of students giving this exam and the cut-off, therefore scoring above-average marks will give you a better chance of getting into this institute.

Hope this helps.

Good Luck!!