Answer in brief
The practical exam is organized by the municipal authority of the department where the driving license is issued. The test is conducted by an authorized examiner, not the driving school instructor who trained the student. The specific office, site, and procedure depend on the intendencia.
The driving school helps the student complete mandatory training, arrange lessons, and provide a suitable car if this is included in the contract. However, it does not make the final decision on the outcome. The examiner evaluates completion of the tasks and compliance with the rules according to the established procedure.
Before the exam, confirm the meeting place, required documents, permitted vehicle, and whether an instructor must be present. Do not rely on a description from another department: the route and organizational requirements in Montevideo and a small town may differ.