I won't talk about the civil service exam.
For the recommendation of the school, first of all, you should indicate your intention with the department and make long-term preparations, otherwise it will be easily taken away by the more active students in the department.
You'd better be party member.
If you prepare yourself, it is recommended to take the national examination. The contents of school exams are tests, applications, etc., which are divided into written tests and interviews. There may be problems at the grassroots level in rural areas in the interview. Generally speaking, a school has 10-30 Selected Graduates, depending on the school level.
As for whether you can get in, it depends on your scores in the provincial exam, and then the organization department will come for an interview. Then it's OK.
But it is not clear whether junior college students can take the exam.