It could be problematic to apply for GATE 2025 with an erroneous email address because the email is necessary for communication, updates, and login information. But you should be able to fix it, as you haven't confirmed it yet.

How to fix this:
Open the GATE 2025 Application Portal and log in. Please try logging in with your enrolment ID and password on the GATE application page.

Look for the Edit Option: You can edit information such as your email address if the application correction window is open, which is usually notified following the registration deadline. Typically, candidates can amend personal information within the rectification window.

Speak with GATE Support:

Please get in touch with the GATE zonal office handling your application right away if you are unable to modify the email during the rectification period.