If you have been allotted a seat through TNEA (Tamil Nadu Engineering Admissions) in the provisional allotment and confirmed your admission but now wish to withdraw, you can typically get your original certificates back. However, the process might vary slightly depending on the specific guidelines of the institution or TNEA for that year.

1. Withdrawal Process: You need to formally withdraw your admission by submitting a request to the college where you were allotted a seat. This may involve filling out a form or writing an application to the institution.

2. Refund Policies: Depending on when you withdraw, you might be subject to certain refund policies, where some part of your tuition fees could be retained by the institution as a processing fee.

3. Returning Certificates: Once the withdrawal process is complete, the institution is obligated to return your original certificates. Ensure that you collect them as soon as possible after the withdrawal is approved.