I love the quiz feature for brushing up on my skills. And within each named reaction you can view the mechanism, examples and if you're lucky enough or rich enough--I'm neither--to have a Reaxys subscription you can look it up in their platform as well. Reactions can filtered by level (e.g. basic, advanced) and category (e.g., elimination). And most useful for undergrads, reactions can be tagged as a favorite so they can study and quiz themselves on only the reactions they learn in class. The only improvement I can imagine, is the ability for users to create their own categories.