When does the actual admission process start in Manipal and when does the college starts?

you will be called for counselling according to your ranks in mid-June I guess.Try to attend counselling at the branch you want to join, as it’ll give you a better idea of what you are getting into.
The classes start in 1st week of August, but you are supposed to be here by the end July for all the introductory stuff !!

You will get exact dates in the website !