Nowadays, students only have maybe two months (summer vacation) to rest between high school and college. I read a news yesterday which recommend high school graduate taking a gap year before entering college.In my opinion, it maybe have some positive effect for students because of the huge gap of knowledge between learning in high school and in college.
A lot of students have no way to learn very well in their freshman year and sophomore year because of this huge gap. So they need some time to prepare the undergraduate-level lessons. For example, American students in high school just only need to learn the background mathematics and some easy linear algebra unless taking AP courses, but they have to learn advanced mathematics such as calculus and discrete mathematics in their freshman year in college. It is a big challenge for them to adopt the difficult knowledge which they have to learn.
Otherwise, the possible negative effective of taking a gap year also cannot be ignored. Some students with poor self-control do not use time sufficiently in their gap year. Thus, it hard to say whether taking a gap year good for students, or not.