I don't think that it wasn't part of the lesson plan, I think it's more of a "fell through the cracks" problem. We had a lot of old teachers that were sick a l

I don't think that it wasn't part of the lesson plan, I think it's more of a "fell through the cracks" problem. We had a lot of old teachers that were sick a lot. I think the substitute teachers didn't always follow up on all the planned lessons. In chemistry we had a substitute teacher the whole year in 10th grade. In 11th grade our new teacher noticed we were missing some fundamentals. Turns out we weren't taught any of the 10th grade material. She then did a 3 month crash course on 10th grade material. With the right foundation it was really easy afterwards. Having done some Math and Physics tutoring, I never tutored a kid that really _couldn't_ do math or physics. It was almost always that they lacked some fundamentals and thus couldn't learn any of the advanced material, because they lacked a mental model to grok the information.