Hello aspirant.

As you have scored 260 marks in physics , chemistry and mathematics in board examination and in Karnataka cet 57 marks in physics , chemistry and mathematics , your excepted rank would be more than 70000.

Note that kea will not consider category for ranking , category is considered only for counselling process.

You can also predict college based on your rank , refer 

https://www.careers360.com/kcet-college-predictor

All the best.