Dear student,

If you are doing preparation in coaching then it's better to be in a dummy school. They will ask you for practicals/viva for formalities but you have to do that also for getting a passed certificate of 11th and 12th.

If you take admission in normal school, you have to attend classes, there will be homeworks, tests, practicals, and after that you have to take out time from this busy schedule for self-study and coaching. It would be comparatively more hectic than in a dummy.

Hope it's clear.