My very rural location doesn't allow me to drive my kids to school on a daily basis. Every trip I make into town must have several errands attached to it due to the high cost of gas. The school system sucks here anyway. The library alone is like going into desert, there isn't much there. The only thing this town cares about is football (American football).
While living in my old town, I did ferry my son to school and back everyday, due once again to the bus situation. He was in Kindergarten and the big kids would hit the little ones and steal their things. They would trip them as they got off the bus. Those brats would even throw rocks at my son and me as we waited for the bus. I got fed up and started the ferrying thing. Crazy as it sounds, there were dozens of other parents who everyday would do the same thing. We all got to know each other as we lined the hallway waiting for the 'pickup' children to be released. We all had to sign a log everyday that indicated who we were and who we were picking up.
Am I qualified to teach physics or chemisty? No, I am not. However, I son is picking up those classes at the local college. He had to test for placement and the school was very pleased with his results. He is in the 'dual enrollment' or 'young scholars' program where he is able to attend both homeschool and college.
My daughter is in elementary level of school. When she was in public school, she was constantly achieving high marks in reading, math and science was complaining how boring it was because the class had to wait for some of the slower kids to catch up to the smarter ones. The teachers are even encouraged to use the smarter ones to teach the others, because the teachers don't have enough time to spread out to everyone over the day. I know this to be true, because I use secular, public school teachers manuals, textbooks and workbooks. The teachers manuals explain to teachers how to get smart kids to tutor the other kids, so teachers can work with problem students, do paperwork, plan classes and so forth. These problems increase with the class size.