<em>You could write...</em>
I agree that failing students should attend Saturday school, because they could fall behind on their work, and possibly be held back a grade if their grades are bad. Failing students need to have Saturday school because it could be a great chance to catch up with the rest of their classmates. Saturday school was invented so students like them could do exactly that, fix their grades. So it's a good thing the Department of Education thought of that.
<em>Or, if you disagree....</em>
I disagree that failing students should go to Saturday school, because I believe some students should be able to have a break, even if their grades are horrible. Parents and teachers should go easy on students, because we have so much work to do it could make us feel uncomfortable. It could also put us students under a lot of stress. Saturday school is just a waste of time.
(<em>I hope this helps you)</em>