Most undergraduate colleges and universities require undergraduates to check the weight within 20-30%, while strict schools will require undergraduates to check the weight within 20%n to be qualified. The specified number of duplicate checking rates varies from college to college, and the specific number is subject to the requirements of the school in that year. Extended Information Most undergraduate colleges require that the re-examination rate of undergraduates be limited to 20-30%. Ways to reduce the repetition rate of papers: 1. If you simply change the order of the next sentence or just modify some words, it will be difficult to reduce the repetition rate. You can reduce the total repetition rate of the paper by increasing the number of words in the full text. Of course, you must ensure that the words you add are not repeated, otherwise it will only be counterproductive. 3. If the total number of words in our paper completely meets the requirements, then we can appropriately delete some repetitive contents or put them out in the form of pictures, which can slightly reduce the repetition rate of some papers. Of course, this method should not be used too much. 4. Refer to some high-level foreign literature, clear your mind, translate and write it down in your own words. 5. The' quoted content' format of the paper must be standardized, and at the same time, be careful not to quote too much, otherwise the quoted content will be marked as duplicate. 6. The best way to lose weight is the original method. When you can't just refer to the actual level, you should also pay attention to writing in your own words. After understanding the content of the borrowed article, reorganize it with your own language and logic, and then express what you understand.