It's important to address the wrong birth date on your hall ticket before the exam.  In some cases, a mismatch between your date of birth on the hall ticket and your ID proof could lead to disqualification from the exam. Having the correct information avoids unnecessary hassle and delays during the exam.

Don't wait until the exam day. Reach out to the exam board or school administration that issued the hall ticket as soon as possible. Explain the mistake and inquire about the process for rectification.

The exam board or school will likely have a procedure for correcting mistakes on hall tickets. This might involve submitting a written request with documents as proof of your correct date of birth.

I hope it helps!