Nowadays, some people think that children spent too much time on playing and not on their school work which is not good for their growth.
People always hold the opinions that children don’t know how to use spare(they are just the same with the “use”) time properly. They feels that children watched TV or played computers a lot which definitely bad for their eyesight and mental health. Moreover, as the competition today is more and more fierce getting more fiercer (more accurate), some parents started to afraid that their children will spend too much time on playing and it will give (I prefer you add “negative” to give more emphasis) negative impact to their academic performances and will make them less competitive than children who spend a lot of time on studying.
However, some people hold different opinions toward this. They believe that adults shouldn’t push children too hard because childrens have the right to enjoy their childhood like playing, having fun and do whatever they like. After all, they are young kids.
In my point of view, there are some good ways for children to use their free time. Firstly, children can participate in some activities such as summer camping, sport or volunteer club. These activities is not only good for children’s physical health but also offer an opportunity to make friends. Secondly, children can also take some courses which they are interested like piano lessons, painting or dancing classes and so on. However, studying is still very important to children at school. If a kid can’t catch up the learning progress of the class, then more spare time should be used on studying.
In conclusion, parents should help their kids to arrange their free time properly, besides school works they can also do a lot of meaningful things.

you have a good construction of sentence. keep it up!