I hope we could arrange our time properly/make good use of our time, that is not only to let network games enrich our time after school but also not to dilapidate our study and waste time.

• 我希望我们能够合理安排时间；使网络游戏既能够丰富我们的课余生活；又能够不使我们荒废学业；浪费时间.