I realized I had studied the wrong chapter when I got to school
Did you study the wrong chapter on purpose?
No it was a mistake and I was in a rush.
You should never rush through your school work. You are not taking your school work seriously enough. If you don't shape up, you could end up with a bad grade.
Sorry, I know I messed up.
Do you have a planner you can use to write down your assignments? I think that might help keep you on track and accountable easier than going by memory.