For large-scale wrong questions on the test paper, the page with correction fluid is untidy, and it is slightly troublesome to cut the size using post-it notes. Tearable error correction book, use tear line to divide 8mmX8mm small squares, can be torn according to the needs of the desired size, with self-adhesive on the back, do not need to use additional viscose products. According to the usage habits of the crowd, the color from light to dark is set, which can better distinguish the importance of modifying some contents.