At present, patent agents only need to have a degree in science and engineering, not limited to majors (psychology can be done at present). But whether it will be reformed in the future is unknown.
The exams for agents and lawyers are more difficult. At present, it is more difficult to test agents, so the agent certificate is more popular. As for what is useful, it is useful to do it well and useless to do it badly.
Above. . . .