I am working on Mathematics A, what is striking ar...

I am working on Mathematics A, what is striking are the many spelling mistakes in each lesson, which makes the explanation incorrect and confusing. Reported several times to NHA, but they say that spelling mistakes are part of it. The material is also quite well put together, but very brief explanation. Homework is quickly checked, I do miss a good explanation.
All in all, I wouldn't choose NHA anymore.