My wife has the same problem. She's a public school teacher, and their software makes my eyes want to bleed. They still use a text-based GUI for their attendance system.

And they've got a piece of software to input your lesson plans, but you still need to print it out at the end of the year.

However, the school and the district have leadership problems, so software should be a little lower on their priority list.

I've thought about hacking up an easy classroom/school management app that would be similar to WordPress. Install and go.