Second, many people can't answer, which doesn't mean many people will get stuck in the defense, because the defense is one thing, and the grades given to you by the school in the future are also one thing, so you don't have to worry!
You may not get more than 75 points in the exam, but 60 points is still easy, because the school will not let many people down. On the contrary, everyone is going well, and if you can't answer it alone, there will be a problem.
Third, because the self-taught papers are all made by ourselves behind closed doors, many of them are copied and pasted, compared with the students' papers, we are much worse. The teacher can see the quality of the test paper at a glance, so the teacher will ask more questions when defending. One is to let us know that the paper is not so easy to fool, and the other is to test the mastery of professional knowledge by those students who have never met before.
4. unwritten rules: most of the thesis defense is passed, but it cannot be 100%. There must be a few people (within 10%) who can't get through. Don't worry as long as the quality of the paper and the defense situation are not at the bottom!
Fifth, the school defense may be strict, but the time given is still loose. It's much easier than the theoretical exam, and so is the practical exam. After all, everyone went all the way to Hangzhou and failed the exam. It would be a waste of time and money to go to Hangzhou again. The average school wouldn't be so unreasonable.
Judging from the experience of three thesis defenses (three majors) I have participated in, your problem is not big!