I have less interest in study after 12th what should i do whether a bussiness or diploma

You seem to be confused as to whether to do a business or a diploma since you have lost interested in studies. Education is one of the highest forms of wealth for a person, you know. You should analyse the situation as to what led you to this state of affairs, I mean losing interest in studies. You

If you have a good deal of money, you can think of business. But, primarily, your ideas should be concrete and you should work up on them constantly with all sincerity.