I'd vote for: (1) law school conficential; (2) getting to maybe; (3) Bryan Garner's legal writing in plain english. The writing book has mini assignements every few pages that can be done quickly and will help you in your legal writing classes. For me, legal writing was very time consuming. Now that I have this book, I can see lots of good tips that would have saved me time writing memos. Finding ways to save yourself time, so you can spend it studying the doctrinal classes, is important. And, legal writing is one of those things you can, at least partially, teach to yourself by getting some of the formulaic stuff down ahead of time.