If you are talking about "The Finale of High School Mathematics" written by a companion book, then this set of teaching AIDS is time-limited. Students in Grade One, Grade Two and Grade Three can use it. Students in Grade One and Grade Two can adapt themselves to the real questions of the college entrance examination early, improve their ability to take exams, hold the final score in their hands as soon as possible, and widen the gap with others. Students preparing for the third year of high school can add one more chip in the sprint stage, which can make the finale more handy. Now that school is about to start, this set of teaching AIDS can be prepared in advance.