Hello candidate,

If you're talking about national level counselling, then I am sorry to say that he cannot attend it after the dates have gone or passed away once.

If you're talking about the counselling process for other colleges such as private ones, you can talk to the college administration and follow his instructions for further admission processes.

But as, provided no information about which kind of counselling you are wishing to apply for, so I have tried to provided as General answer to your query.

Hope that it helps you!!