be a better writer

I teach writing at the college level and want to know grammar better so that I can teach it better. My grammar is fine, but I have a pretty instinctual sense of why/how something works or doesn’t… plus I want my writing to be a good model of grammar to them so that I’m always practicing what I preach!

I’d like to find some program or something that will lead me through exercises… I’m a grad student so “studying” doesn’t sound very fun. We’ll see; I’ll come up with something.