Students can check their visa condition via this link before coming to Turkey to complete their registration process.
If you need to get Visa to enter Turkey, you can apply for it with your Official Acceptance Letter which states that you will be our student here in Turkey. Once you arrived at BAU and completed your registration, you can apply for residence permit with your student certificate.
You can reach residence permit application guidance through the links down below. Please follow the steps carefully.
First Time Residence Permit Application Guide
Renewal Residence Permit Application Guide