I also work in Kunshan. As far as training institutions are concerned, Kunshan is nothing more than Kegao and Yixian. As far as I know, Yixian in Kunshan is more famous than Kegao, but I don't know who is more professional in engineering. I'd better go directly to the training structure and ask them what they say.

If you take the self-taught exam, it depends on whether you want to look at it from practicality or just want to get a diploma. If you only get a diploma, you can become a teacher as soon as possible, but the diploma is not excellent. In order to get a diploma, they usually choose to skip their own majors, such as linear algebra and English. If you apply for the exam for practicality, don't apply for the related major you are engaged in now, such as civil engineering design. Specifically, you should buy a self-study material and study it slowly when you register in the study room.

I'm tired after playing so much. Work hard without credit, hehe!