Generally speaking, the preparation for the civil service exam will begin one year or at least half a year before.
If you really don't have a good foundation, or want to get high marks, you might as well attend the training. Alas, is there really too much training for civil servants? , a lot of big institutions, a lot of black inside story. Here, I want to recommend a new celebrity study, which many people don't accept, but the pass rate is very good.