Many students are not weak because they are lazy or incapable. They struggle because Math can feel like a mountain of proofs, side concepts, special cases, and niche applications. In the middle of all that, it becomes difficult to identify the core principle behind each topic.
As school lessons move on, earlier concepts start to combine with newer topics. A weak understanding of algebra affects functions. A weak understanding of functions affects calculus. One gap creates another, and the student slowly becomes overwhelmed.
When students cannot identify the commonly tested concepts, they do not know where to focus their energy and attention. They may work hard, but their effort is scattered.
This becomes worse when they are facing many deadlines at the same time: project work, schoolwork, tests, and exam preparation. Revising and solidifying past concepts then feels like a luxury, even though it is exactly what the student needs.