I'd love to have different sets of studying

I’m an english teacher, so I’d love to have a way to save all the words in a folder, or something like that, so I could make a folder to every group of students that I have. I’m loving this extension but I’m having this problem. I have a class with group A and then I need to erase all the new words we’ve studied to start a class with group B. And, after doing it, during the next class with group A, we will have to save all the same words and new ones instead of reviewing and adding new ones. (Or you could create a way to import old lists)