Hello,

There is no way to correct it now. Put a mail to the board to guide you and help you out from this situation. I don't think there will be any way as it is important to give correct details and they can't correct it individually. Your form may get rejected.

Still better to give a try and ask them to help you out. Apply for other entrance exams too. This will make you open for new opportunities. Don't get sad if your form gets rejected as they have to follow the rules.

Look for some other entrance and try for them too.

Hope it helps!