Is this against the rules? : Form a study club where people make schedules and we help each other to follow their schedule of writing homework

Q2: What is the difference between Last Active and Last Post?

Not sure about that, but make sure you avoid sharing homework answers with each other. It might likely lead to plagiarism in which it might lead the whole study group to get 0 grades on their assignments as Plagiarism is highly not tolerated.

You mean IC rules or OOC site rules? I don`t think so, that can actually be useful to help each other keep update with homework. I think there is a first-year study group here that is quite inactive, so maybe you can contact Marina to take over it if you wish...
As for the Plagiarism thing, I agree with Ashley!

If you just help them with productivity, its fine.

Last active is maybe stalking around the site, last post is actually posting