1. Source control concepts (branch, merge, tag, revision, conflict, etc.). Ideally some hands-on experience w/ the most popular options. This wasn't even touched on in my undergraduate program.
2. How to accurately scope projects and manage my time.
3. The importance of making sure you're always working on something that will help you land your next job. If that isn't the case then it's time to start looking for your next job right now.