What are the circumstances that prevent me from taking the patent agent exam?

What are the circumstances that prevent me from taking the patent agent exam? A patent agent refers to a person who has obtained a patent agent qualification certificate, holds a patent agent practice certificate and is engaged in patent agency work full-time. So what are the circumstances that can't take the patent agent exam? If you don't take the patent agent exam, what are the circumstances that you can't take the patent agent exam? (1) Having received criminal punishment for intentional crime; (2) Being disqualified as a patent agent; (three) the examination qualification has been cancelled for less than three years due to the circumstances stipulated in Article 12 of these Measures. (4) Those who take the patent agent qualification examination shall not take the examination, and shall not engage in teaching, answering questions, counseling and other activities related to the patent agent qualification examination. What are the situations where you can't take the patent agent exam?