Hello Aspirant

As you have mentioned that you have entered the wrong mail ID, but you have not elaborated on your question, where you have made this mistake in some form of filling, competitive examination, registration or college, so I am guiding you with the steps you can follow.

Go to the account or form where you added it and check for an Edit or Change Email option.
Update your correct email ID and save the changes carefully.
If there’s no edit option, contact the website’s help or support team for correction.
Once changed, verify the new email by clicking the confirmation link.
Always keep a screenshot or mail proof for future reference.