Hello Aspirant

Generally for most of the university the criterion is you should have minimum of 65% marks in overall and in mathematics and in PCM is required to take admission in B. Tech degree course. for reserved candidates the percentage varies from 50% to 65% according to the university.

https://engineering.careers360.com/colleges/list-of-be-btech-colleges-in-bangalore

Visit this link once for clarification of all your doubts.

Here are the topmost colleges of Bangalore.