It's not necessary. Nowadays, graduation thesis, no matter what form of education, is unified enrollment, and most of the contents of graduate students are borrowed, and the teachers who defend them all know it, so it is not too difficult to defend the thesis in the form of adult education. No matter how well your paper is written and how much you have learned from it, you must be familiar with it. The teacher will ask questions according to the content of the paper and the relevant background. Although the teacher won't embarrass you, you can't ask questions without knowing anything, and it seems strange to the content of the paper. These are all unreasonable. I haven't heard that anyone around me has participated in thesis defense training. People who have defended generally think that defense is relatively simple. I made a defense in the first half of 2009, and it was not difficult.