TX Tech Graduate Math Certificate?

I’m looking to take some graduate level MATH courses that are reasonable for an in-service teacher. I came across the Graduate Math Certificate program at TX Tech and am wondering if anyone has any experience or information to offer. Reasonableness? Grading? Availability? etc.

I do have an undergrad in Applied Math and have taken some lower-level graduate MATH courses recently to get back into the material. The school (A&M Commerce) where I am working on a Masters in Education doesn’t have a lot to offer in the way of graduate level Math for in-service teachers looking to teach DC or 2-year as adjunct.