This supplemental resource includes practice questions in Algebra, Advanced Math, Problem-solving and Data Analysis, and Geometry and Trigonometry. For each topic, questions are divided into three levels. Level 1 questions are the "easiest". You should expect to see many of those, particularly on Module 1 of the math SAT and the standard level of Module 2 of the math SAT. Level 2 questions are "standard" and appear consistently throughout all three modules, and Level 3 questions are "challenging". The levels, however, are subjective as they rely not only on problem-solving skills, but also content knowledge. In other words, you might find a level 3 problem easy because you have deeper knowledge of that particular concept. Likewise, you might be challenged by a Level 1 problem if the concept is unfamiliar to you.
The book also contains one full-length practice test with three modules. Additionally, there is a complete and mostly handwritten answer key for every practice set and the practice test. Finally, the book contains a linked Google spreadsheet with Desmos links for specific problems as well as topic and skill data for every question.
Description of practice sets: