I have both of them. I have finished one, and the high score guide is a bit difficult. Most of the questions and skills in the two books are the same, but they can complement each other. It seems that the spread of knowledge is more thorough, and the methods of killing seconds are more than those listed in the high score guide, but even the printing of genuine books has many mistakes, so I make corrections while doing it. I didn't use the math volume to get started, but I did all-in-one directly. My math foundation was poor, and I was badly abused at first, but I thought the math exam was so difficult that I gritted my teeth and survived.