Re-do System

I think that teachers do this re-do system is to let us have a second chance to do our work and get a better grade. I think this system is important to my learning because I can fix the mistakes I have made and know what I did wrong. I like this system because I get to have a second chance in my work. What I dont like about this system is that sometimes I wont get my work back and I will hand in my work late.