Cost uncertainty
The specific cost is hard to say. There is no upper limit, only a lower limit. I suggest you bring hundreds of yuan bills, and refund more and make up less.
flex time
You can apply at any time, depending on where you sign up. The test center has just finished a batch of exams, and it usually takes half a year for the next batch of institutions to have enough people, so you should find a station that has not passed the exam in the first half of the year to register.
The registration process is simple.
After registration, you will be informed of the time and place of the exam after paying the registration fee.
This certificate is used all over the country.
After the exam, you can get the certificate in about a month (people try). If measured by computer, the time will be longer, several months. This is national. If you have special requirements (such as teacher qualification certificate, some places need money), you will be asked to take the exam at the designated place.
The teaching materials are used all over the country.
If necessary, you can buy the Putonghua proficiency test course in Jiangsu, which is available all over the country.
Widely applicable to people.
The exam is not an exam, please search for "Putonghua proficiency test content" by yourself. Universities in Nanjing can generally sign up, but it's up to you whether to accept people from outside the school to sign up.