Good grief, what are you studying? I found college to be not that dissimilar to what you’re saying (graduated in 2004, then took graduate courses) but once you’re two years in to a hard science program things get better. I was homeschooled and definitely saw what you see. But I never got extra credit for anything unrelated.
It was a second year math class. See my Post #41 for more details. I was shocked too. I’m getting an A in the class, but I did the extra credit anyway (mostly because I love carving jack-o-lanterns). I sympathize with the teacher, she is under pressure for most of her kids to do well & they just couldn’t care less.