Hey,

You might stand an outside chance of getting a good govt college with 75 percentile considering you belong to ST category. You may not a very good branch in a good govt college, though a good college with lower branch is very much on the cards. Therefore i would suggest you to wait for the open rounds as well. Good luck.

Yes,you can get but you should update in economically back ward cast website then you will get again a rank then you can join