Hello, I'm happy to answer your question. A trainee lawyer refers to a person who has not obtained a lawyer's practicing certificate and cannot represent him in court. When you talk about students with lawyer certificates at school, do you mean lawyer qualification certificates (or legal professional qualification certificates) or lawyer practice certificates? If you don't have a lawyer's practicing certificate and only have a lawyer's qualification certificate (or legal professional qualification certificate), you can't appear in court on your behalf.
Lawyers Law of the People's Republic of China
Article 13 Persons who have not obtained a lawyer's practicing certificate may not engage in legal services in the name of lawyers; unless otherwise provided by law, they may not engage in litigation representation or Defense business.