I wanted to be a class leader and practice myself.

我想成为一名班干，并且锻炼自己。

youdao

If I become a squad leader, I will be more strict demands on themselves to do better, become a role model, and let our class better, become a leader in the whole school year.

如果我当上了班长，我会更加严格要求自己，让自己做得更好，成为大家的榜样，也让我们班更好，成为全年级的佼佼者。

youdao