The lecture structure is so good If you understand and follow the previous lectures well, you will have no problem understanding the next lectures If you follow it well until the end, you will be familiar with most of the problems The table of contents is also well-divided, so even if you only look at the table of contents after taking the class, - Oh, what was this about..? (click) - Oh, I know this It was so helpful in identifying weak points and saving review time, and on the day of the test. I feel like I got good results