If you don't work as an agent in a patent office, you don't have to take an agent exam. If you want to do patent management, you can take the "Enterprise Patent Management Engineer (Intermediate)", and management is enough. This engineer is not tested in every city. Please consult the local intellectual property office for details.
Of course, if you pass the agent exam training, it will be of great benefit to your work. For example, a master's degree can do your job, but a doctorate degree is certainly better.