Agree with above. Seems like both my kids when getting bad grades was because of a bad teacher. I would comment “glad you didn’t have too many of those.”
My kid had an 504 with the same limitations of not calling on him due to slow brain processing and some other things. A few teachers told us they just didn’t believe in such a thing. This is where I stepped in to make sure each teacher indivually was aware of the accommodations. It wasn’t like he never answered questions, he just needed some extra time to do so. We had many meetings with the school until they got it. It took some time… 504 I think is like a legal document and needs to be followed. There are also educational lawyers if needed. Through this process my son also learned to advocate for himself since if he didn’t then I would.
It’s funny since in college it doesn’t seem he needs the accommodations that he needed in high school. But they are there just incase.