I am a high school student majoring in electrical and electronic engineering. I have always been interested in college mathematics, and I was able to get started by completing this course. Thanks to the thorough and kind explanation of all the contents in the book, I was able to cover all the concepts without missing a single one. There are many parts that overlap with high school calculus (single variable calculus), such as continuity and differentiability, and by looking at these, I was able to review the concepts that I had missed. Also, the concept of matrices was often used in the explanation, so it was good that I was able to get used to the concept of matrices that were unfamiliar to me. I plan to continue taking the next series.