when is the admission of first ear

Hii Subhas!
Sorry, but you haven't mentioned the name of the board or the institute in which you are interested to take admissions in the first year and thus asked the question. You also didn't mention the stream of subjects, you would want to study. Thus, it's a request, please restructure your question and ask again giving the proper information regarding the question. This will help us to provide you with detailed answer. In general, usually the first year admissions are conducted in the month of May and June and the commencement of the semester accordingly. But, please specify the name of the institute. Hope you understand.
Good luck!