This is an honest review. First of all, the explanation of the concepts is very lacking.. I am waiting for the results after taking the practical test this time. Even in the case of Type 1, it is difficult to solve with this level of concepts. I heard that it was a lecture that even non-majors could do, so I bought it, but it is a bit disappointing. Even though I bought the paid lecture, I am very disappointed that I have to look for other books to study to understand the concepts. For those who already have a basic knowledge of this field, this lecture would be good for organizing, but since it is written as a lecture for organizing, any lecture would be fine for those who have a basic knowledge. The Big 60 itself has been easy so far, right? I hope the lectures will be reorganized a lot in the future.