“Do they get letter grades?”
It would seem pretty silly to get a B- in football wouldn’t it? Maybe they just use pass/fail when they count sports for PE credits.
Depends on the state and the school. Some give letter grades that might be based on attendance and participation. Or they might just give either an “S” or “U” stands for satisfactory or unsatisfactory.
Many base graduation on the certain number of credits. When I was in high school, we needed 24 credits to graduate. Math, Science, English, and Social Studies courses were required each year. The other two credits are electives. That would be 6 credits per year, for 4 years would equal 24 credits. If you fail a class or get kicked out, you have to make it up in summer school or risk falling behind your class.