2. The Putonghua certificate has no validity period (although it claims to be valid for five years, it is not actually implemented)
The difficulty depends on my language ability and the influence of local dialect. I come from Zhejiang, but I passed Grade One without any preparation. Many students in our class are still Grade Two. If you attend a training class, the teacher can remind you what to pay attention to in the exam according to the characteristics and defects of your pronunciation. I have tutored several students myself, and the effect is obvious after training.
4. Since April, 2008, Jiangsu Province has started to implement computer testing of Putonghua.
I'm glad to answer the landlord's question. Please forgive me if there is any mistake.