A month is different for different people. Some people have no job and can study for more than 8 hours a day for a month. Some people may be busy with work, and their study time may be less than 3 hours a day in a month, that is, one month. The gap is still quite big.
Introduction to national examination
The national civil service examination, referred to as the "national examination", has relatively strict recruitment conditions, generally requiring full-time undergraduate graduates and previous graduates, and some positions require graduate students and college English levels 4 and 2. The time is relatively fixed, generally concentrated in 10- 1 1 every year.
Baidu Encyclopedia-National Civil Service Examination