>>13375069School can be improved.
Math and science should be taught more quickly, with less emphasis on learning other subjects, which aren't nearly as important in the modern world, and there should be free tutoring for students lasting several hours after school ends to help younger students conceptualize all the math and science they're learning. It could simply be college students deciding to do their homework and study at a local high school, or high school students deciding to do their homework and study at a local middle school. When a younger students would get lost, they could come up to a volunteer tutor, and get some free tutoring.
If students can't keep up with the classes, even after tutoring, then they just take a slower route. If you want your nation to be as educated as possible, you will not hold back the better-performing students. It's fine if some of the students are two or three years behind the other students in math class, as long as students are getting educated as much as they possibly can.
Math is taught far too slowly in school. Kids go over fundamental arithmetic repeatedly, and kids typically don't even look into any algebra or geometry until the 8th or 9th grade. I remember going over PEMDAS for multiple years. PEMDAS would've began to make much more sense had I been introduced to algebra the same year. This would be equivalent to going over Ohm's law for years before even looking at a single electronic circuit. At least half of 4th graders have the mental capacity to understand basic algebra. The concept of plugging in for x in algebraic functions is not that difficult to grasp.