Hey,

Sorry but your question is not clear for me to answer it accurately.

I want you to help me with a properly phrased question that I can understand and help you with correct information.

But from  the angle I can understand, the 12th exam will be conducted along with all the 12th exam of the CBSE students. If you are asking for improvement then you will have to wait for next year. The improvement exams for private candidate also takes places at the same time with the regular students.

Hope that helps.

Thank you.