I paid for the course without watching the sample lecture, and at first, I was a bit flustered. The instructor takes notes directly in a Word file, which felt a bit chaotic ㅠㅠ. Also, since I’m short on time, I usually listen at 1.5x speed, but there were many filler words like "um..." and "uh...". Plus, I only saw 2019 past exam questions, so I worried I had chosen an outdated course. However, it turns out I made a good choice. I took this course to focus specifically on the ADsP content, which has a narrower scope than the Big Data Analysis Certification (BDAC) written exam I already took. Since I theoretically knew most of Subject 3, I only watched Subjects 1 and 2, parts of Subject 3 that I couldn't remember or needed supplementing, and the past exam explanations. Contrary to other "cleaner" (?) lectures, this one was more detailed for each topic. The instructor shared backgrounds and other helpful information, which helped me recall the content and gain a deeper understanding of the techniques in Subject 3. Also, about 2 or 3 questions from the past exam explanations appeared identically on the actual exam, which was very helpful. I think I’ll pass comfortably. Although the course is labeled as ADsP, I think it would be good to watch it all the way through again when I challenge the ADP later.