How to enter the Ministry of Justice?

After passing the national unified judicial examination, the Ministry of Justice will issue a legal qualification certificate, which will be signed by the Minister of Justice (although it is a copy), and then you will be qualified as a judge, prosecutor, lawyer and notary. However, judges and prosecutors have to take the civil service examination first, and lawyers have to practice in law firms for one year before they can apply for lawyer qualification certificates in the Judicial Bureau. I don't know anything about notaries. Basically, this legal qualification certificate is a stepping stone to enter the judiciary or lawyers, which is used to exchange the other four professional certificates.