What does Chengdu Black and White Volume mean?

Black-and-white volumes are two sets of volumes written secretly before the exam (including black volumes and white volumes):

1, the black volume highlights the required test points and the answer activity column to explain again.

2. The white paper focuses on supplementary speculation.

3. Use black roll first, then white roll. Because of the guessing and explanation on black paper, I can practice all kinds of required test points and questions and be familiar with all kinds of knowledge points after I finish the black paper and check the analysis (there are expanded guessing and activity columns in the analysis). Mastering these can make a blank sheet of paper more handy.