It doesn’t matter what happens in other hs. Nor what various parents think. OP has an issue, regardless, for her child, at his high school.
I don’t think she’s going to get far by insisting it’s not fair. In fact, she didn’t. She wants help getting her bearings and weighing options.
The tutor idea is interesting. With that, would they let him grad with a degree from that high school, assuming he ran through the right hoops? We had two do that at our prep, but one had medical reasons, the other was a different mess.