What to learn depends on the kind of police. If it is comprehensive teaching, it should be civil servant law, police law, criminal law, criminal procedure law, administrative punishment law, public security management punishment regulations and so on
Official document writing, civil servants' professional ethics, civil servants' psychology and so on.
Police skill training, attack technology, defense technology, copying technology, control technology, gun technology (I haven't practiced if conditions permit), tactical thinking and so on.
The assessment is divided into written test, interview, written test and what to take. I have never heard of any failure.
The Ministry of Physical Fitness and Public Security has a document with detailed standards, different gender and age standards, and strict standards, but it is your instructor who assesses you, okay?
Anyway, don't worry, it will really delay your life and won't become a sworn enemy. There is really an unqualified normal person who was disqualified for whoring [Harmony] three days before the end of the training. You must be patient.