Math is a hard, abstract, mental discipline, so it’s very plausible that mere exposure to some concepts increases the subsequent understanding. For example, I

Math is a hard, abstract, mental discipline, so it’s very plausible that mere exposure to some concepts increases the subsequent understanding. For example, I was one of the best students in class, yet it took me about a year to really get stochastic processes. Taking advanced classes could be valuable even if you need to retake them.