Hello Ravikiran,
Hope you are doing well. Campus selection takes place in every engineering colleges, not only in Bangalore but throughout the country. It depends on whether which companies come for campus recruitment and whether students are placed in those companies. Campus selection also depends on the type of colleges. If a college is very popular and stands in a top position, more companies are likely to visit the college. Tech Giants like Google, Facebook prefer students from colleges like R.V. College Of Engineering, M.S. Ramaiah Institute Of Technology. I hope you got the point after reading this answer.

All the best.