However, it's not easy. In my opinion, those kids who are good at learning are able to manage their time very well. They not only work hard at their subjects but also enjoy playing games. Playing also helps them learn better.
As to how kids balance learning and playing, the most important thing is to follow the rule—work while you work and play while you play. Moreover, kids should learn to work happily and relax totally.
I'm sure a good balance between learning and playing is good for kids' growth.