Many children study with a "getting by" mindset — coping with parents, coping with teachers, coping with exams. But once that mindset disappears (for example, after the exams), learning stops. Cultivating the motivation to learn spontaneously is what enables children to keep improving.
The key to spontaneous learning is interest and autonomy
When children are interested in something and have the freedom to choose, they will naturally want to learn more. For example, some children love dinosaurs and will proactively read many books about dinosaurs, without their parents having to push them at all.
How to cultivate spontaneous learning
First, allow children to choose the areas that interest them. Even if the interest seems "boring" (for example, studying insects or coins), it should be supported.
Second, let children take part in setting goals. Do not decide goals for them; instead, guide them to set their own goals. For example, "which subject do you want to improve in this term?"
Third, celebrate progress along the way, rather than only looking at results. Let children know that the effort they put in during the learning process is worthy of respect.