1. I don't know that the duplicate checking rules of papers are considered plagiarism: different duplicate checking systems have different rules for duplicate checking, so before duplicate checking, you can first understand the plagiarism identification of the selected duplicate checking system, and then choose to modify the papers to avoid the risk of high duplicate checking rate.
2. The paper's duplicate checking rate is qualified, but the tutor thinks it is unqualified: at this time, it is mostly caused by the confusion of paper layout and unclear word order. Therefore, I suggest that you put your papers in the typesetting order required by the school first, and then check them again. If necessary, you can also consult your tutor.
3. Can duplicate parts be deleted directly? The duplicate checking system calculates the duplicate checking rate by the proportion of repeated words in the full text. If we simply delete the content with high repetition rate, it will not only reduce the number of words in the paper, but also affect the coherence and logic of the sentence, which is not conducive to duplicate checking. This is not recommended.
4. Add content directly to reduce the weight: In addition to direct deletion, many people will blindly add some content with high duplicate checking rate, but you should know that blindly adding content will also affect the coherence and logic of the paper, and it is very likely that new duplicate content will appear, so even if content is added, appropriate methods should be taken.