category drop-downs / hotspots / twisties

Is there any kind of plugin that would allow me to compress categories in any way? Ideally, I’d like to click a link and see several categories drop down. I know there is a way to create a drop-down list for all categories. But if creating a drop down, I’d need to create 12 drop-downs, so this is not the ideal method.

The problem I’m trying to overcome is one of organization and usability. I’m planning to use blog categories to store writing assignments for an English class I teach. Each class, students will submit four separate blog posts. After 12 classes, that’ll be 36 categories! You’ll have to scroll to see them all. I am looking for a way to compress them under Week 1, Week 2, and so forth. Any ideas? Thanks,

Tom
site: https://www.idratherbewriting.com/itt