The youngest students in elementary school require a lot of attention from adults to help them learn, but their educational needs become less strenuous as they age. Children who have made it past the primary grades are often expected to learn more with less supervision in the classroom. They have also been observed by their teachers, and their level of learning ability gives the education system a chance to help them in a different way.
Each person learns at their own pace, so separating students by their abilities is part of advancing past the elementary level of education. A student who learns quickly in every class will be grouped with those who have the same ability. While there is a wide margin of learning ability covered in each group, students are given a teacher who plans their classes to suit their students. In this way, fewer licensed teachers are necessary for those who excel in a subject.
Students who have a difficult time learning any subject will often be grouped into smaller classes where they receive more attention, and this scenario gives them a better chance to comprehend their lessons. The students who have the most difficulty will often be given a tutor to help them along, but some of them will be retained at their grade level if they have too many issues. While many parents feel this is a disciplinary measure, it is often taken to help the student learn what they need to know for academic progression.
Class sizes for children past elementary grades are often much larger, but students are given an opportunity to learn with less direction. School districts that follow this type of educational plan are focused on spending their resources for the good of the entire student population, and they strive to provide each student with the level of education they will need to progress to the higher levels of education within the system at a pace they can handle.