Impressions during the class 1. Amazing compression and delivery power that losslessly compresses content that would normally take 2 hours into 10 minutes. 2. The biggest obstacle I face while relearning high school level math is that I have to endure boredom because it is something I can understand if I listen to it, but the background explanation related to the field never gives me time to get bored. 3. Since the lecture terms are in English, the pre-learning effect is a bonus for me who plans to read math-related original books at night. Why did the heavens send me an engineering major now...