What should I do if I take the eight-character exam with my mother and say that my name is not good and I don't want to change it?

Names may play a role, but they are not the main role. It is important to do more good deeds and have a good attitude. You can look at "Four Disciplines for Fan Fan". You can try to convince your family that people with good names may not live well. There are many such examples. Personally, I think fate can only be changed by a lot of good deeds. The rest can only be fine-tuned. Including renaming, choosing a date, etc. In addition, if you believe in fate, you should know that all this is fate.