Study Guide problems by category & skill/knowledge

Based on examination of all 464 math questions in The Official SAT Study Guide (2018 edition), this document consists of a 6-page table of skills and a 3-page table of knowledge (facts, equations) needed to answer them.  The row for each skill/knowledge item includes a cell that specifies the questions that rely on it.  This will enable students to more easily study a group of similar problems focused on their specific needs.