Where can I do my medical health check?

This is not a common requirement in an offer letter, but if your offer requires you to do a medical health check (typically if you are applying for a healthcare-related course, or if you have a pre-existing health condition), you will need to approach an approved clinic to carry out the specific checks as requested in the offer letter.

The list of approved clinics may be specified by the university. Otherwise you should do the check in a clinic that is reputable and can provide an official health report.

This answer addresses the medical health check requirement as stated in the offer letter, and is different from the medical health check that may be required by the immigration authority when you apply for a student visa