Hi aspirant,

National testing agency had clearly announce that they would be no correction window for the JEE main examination 2022. So there is no way he can it his date of birth before the examination. However tell him not to worry because at the time of counselling a seperate registration form would be provided to him in which he needs to fill all the details for the counselling including his personal details and the category certificates, furthermore the counselling is conducted on basis of that data only so he won't also face any problem at the time of document verification.

Hope it helps!