Unfortunately, once the deadline for entering NEET marks on the KEA website has passed, you cannot enter them. This is a common policy for many admission processes.

Here are some potential steps you can take:

1. Contact KEA Directly: Reach out to the Karnataka Examinations Authority (KEA) through their official channels, such as phone, email, or in-person. Explain your situation and inquire about any possible exceptions or late submission options. They might have specific procedures in place for such cases.
2. Check for Updates: Keep an eye on the KEA website and any official announcements for any changes or extensions to the deadlines. Sometimes, due to unforeseen circumstances, they may reconsider their original timeline.
3. Explore Other Options: If KEA is unable to accommodate your late NEET mark entry, consider other options available to you. This might include applying to different colleges or universities that have not yet closed their admissions processes.

Remember to act promptly and be persistent in your efforts to resolve this issue. Good luck!