A normal school day for any youngster could include a subject or two they enjoy, and the rest might be dreaded. Some students find it easy to learn the rules of grammar in their language, and they could see mathematics as a subject made for them. Science could be a complete joy until they discover chemistry and biology. Tackling complex concepts could feel like they are suddenly stuck in place, and that alone could turn them off a particular subject.
Most schools do present information to their students that is geared to their age level. Educators have found students learn at different rates, so they try to choose learning plans that are not too difficult or too easy. Hitting the middle of the class provides them with an opportunity to see which students learn it quickly and which ones will need additional help. The teacher could give them extra work or explanation, but they might also speak with the parents about a private tutor.
It can become a major struggle for any student falling behind during a class. Some subjects can be caught up by additional reading, but concepts that are complex do not always fall into that category. The student may have to struggle through as best they can, and they could always take the subject again once they have matured. They would tend to have a great level of understanding the world as a whole, and that alone could help them find ways to learn.
Each student learns at their own pace, but they do occasionally find there are subjects they just fail to understand. The ability to work past that is a gift that may come from working harder, or it might have to wait until they are old enough to revisit the subject as an adult. Either way, they may have a good opportunity at some point to learn it.