Generally, in a year, you register in March-April, take the theoretical exam in June-July, and take the practical exam and thesis defense (advanced or above) in July-August.
The entry threshold for junior (level 5) is very low, and a little work experience is enough. Generally speaking, theory is the mainstay, practice is the basis, and the assessment items are many and complicated, which is more troublesome.
After working for 3-6 years, you can apply for intermediate (level 4)
After another 3-6 years, or 13 years of work experience, you can directly take the Advanced Level (Level 3).
In another 3-6 years, I will take the technician exam (it is a national second-class and must be a senior holder for more than 3 years), and there are also thesis defense projects.
Technicians who have been certified for more than 3 years can apply for senior technicians (national level), and the paper mentions 5000 words from 3000 words. Passing the exam is equivalent to the level of associate professor (technicians and senior technicians enjoy state technical subsidies).
Others, such as super classes and special classes, are all at the local level.
Among them, the intermediate level is divided into three levels, two levels, 1 level, advanced and super, and also divided into one or two levels, which is purely a bluff. In addition, the so-called "national first-class baker" is also a wild road, and the state does not recognize it.