I believe that when it comes to manners, we can never have too many and it not embarrassing to take a refresher course.
A refresher course at your local high school, community college or fabric store will do you wonders.
These changes necessitate a refresher course in bus safety, but middle school students also face new challenges with the school bus.
If you're going to take up swimming as a regular workout, you should consider taking a refresher course first, because the difference with using a stroke exactly as it's meant to be versus not can really change your workout.
If you could use a refresher course on spelling, grammar, and punctuation, or you want to learn more about how to write in a particular genre, free e-courses can provide a good starting point for your studies.