I bought a book called Network Engineer Examination-Analysis of Test Sites and Solution of Examples.

This is recommended by the teacher. Compared with other books, I think it is very suitable for students with poor foundation.

Then I made a book "Analysis of Test Papers and Test Sites for Network Engineers' Sprint Prediction before Exam".

I watched the video of Cisse. Com, and the test papers over the years, the results are easy to pass.

Internet workers' papers are not difficult to test, but they have a wide range of knowledge. And sometimes even take exams on very similar questions in previous years.

As for training courses, if you know that the teaching quality is good, you'd better go to training, but you should stick to it. I hope my answer is helpful to you. Thank you.