Top colleges im bangalore require a rank around 5000 maximum to be honest. But other general colleges accept ranks upto 30k. 

 would suggest you to use the College Predictor tool to know about your possibilities for admission. You can fill the required fields like your category, preferred branches and know the probable chances for getting admission to colleges based on your rank.

Refer to the link below to use College predictor tool-

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