You can't score Your Percentile on the basis of Marks because Percentile depends on a lot of other factors too which are equally important. Because Students are less this time and also Paper Variation also affects a lot. So One can't decide easily the percentile on the basis of marks.

But You can get admission in good college as you have scored good and you also belong ro ST Category and that will be very much helpful for you.

So Let's Wait for the Result and Hope for the Best You will score well.

ALL THE BEST :)