Again, this is something that is portrayed frequently in American movies but does happen in real life too. The idea that someone from your own school year can tutor you in a subject seems pretty weird to the rest of the world. Sure, they might understand it slightly better than you, but they’re not a teacher.
Elsewhere, the culture is more to employ an adult, or a college student to come and tutor you, and pay for the service. These people tend to have teaching qualifications, and you know, actually know what they’re doing.