Hi there,
Hope you are doing well.
Generally the examination for the students appearing in the compartment examination is taken separately and not with the regular students which are appearing for their boards exam first time.
The paper is also different for both types of students and the timing and date of the examination is also separate from it. You can check more about the compartmental examination by visiting the official website of the examination authority and the state board in which you are appearing for the examination and thus get a detailed idea about the examination and all the necessary stuffs related to it.
Hope this resolves your query.
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