1, this set of books uses mind maps to build a knowledge system, combs content points with lines of different colors, intuitively presents the context of knowledge, and makes the learning and memory process easier and more efficient. Determine the use of color from the beginning, the topic is blue, the key concept formula is red, the important knowledge point is highlighter, and the relevant background is highlighters of other colors.

2. This set of books is equipped with a large number of hand-drawn cartoons, which explain the important and difficult points and common test sites with vivid cartoons, simplify complex knowledge, and help you master knowledge easily and study happily. Simple illustrations will move the mind more deeply, and using illustrations to express knowledge will greatly improve the interest and efficiency of learning.

3. This set of books presents the key points, difficulties and error-prone points summarized by many famous scholars and front-line teachers in the form of handwritten annotations, and the key points and difficulties are clear at a glance.