What does a patent for utility model with xx school as the first patentee and my signature as the first person authorized and approved by the national patent authority mean?

Refers to a utility model patent, the first patentee is XX school; The first inventor was you.

You see, the utility model specification has the patentee: A, B or A, and this A must be XX school;

Inventor: A, B, C, etc. A must be yourself, the first name emphasized here.