I didn't know about the cloud, so I started from the introduction, but it was good because it was organized well. In the case of the practice problems, there were some problems that were almost similar to the actual test (9/16) or that I didn't get wrong. I was worried because the cloud was unfamiliar, and although it wasn't a difficult test, I gained confidence by passing it, so it was good. I will also apply for the next lecture. Thank you.