Don't worry, undergraduates don't need to check the similarity. They should hurry to get the paper out first and defend it at the end of June.

Then find a more understanding classmate to explain the important things of your paper to you, help you make PPT, and pay attention to what you can't write on the PPT. After that, you recite what you want to say, and speak as much as possible when you reply, so that the teacher will have less time to ask questions. Then find a tutor in advance and ask him to help you make a speech in your defense, and it's ok.