I don't think it's healthy for children to work only for grades. It puts a lot of pressure on them and can make them stressed or anxious. Sometimes, they stop enjoying learning and just focus on getting high marks. Also, they might not have time to learn other important things like teamwork or being creative.

Grades are important because they can motivate students to study and help them get into good schools or jobs. But I think it's also important for students to enjoy learning and have time for other things, like hobbies or spending time with friends. There should be a balance, not just focusing on grades all the time.

Some children are naturally competitive and like working hard to get good grades. For them, it can be a positive thing because it helps them build discipline and a strong work ethic. As long as it doesn't become too extreme or stressful, I think it's okay.