It's interesting to see someone with this problem. I don't know where you're from, but many schools take it for granted that their students know how to learn because they see that students are learning some things. At the moment, there is the idea that "multiple intelligences" exist. I don't really care for that title because people are then prone to saying things like, "I'm intelligent in another way" which sounds like an excuse. Anyway, the theory of multiple intelligences basically looks at learning styles. People take in, process and retain information in different ways. For example, some people learn well by listening and taking notes, or by reading about something or perhaps they learn best when engaged in physical activity. Perhaps you might think about how you go about studying and try different things. I bet if your instructor knew that you were actively doing something to try to better your understanding and your scores, then they would be supportive of that. Good luck!