I recently took this test and pass first try.
The training I went with was uCertify.com. The price was decent and the content was exactly how I learn. They do it by giving you a LOT of stuff to read and then testing you on what you read. It is multiple choice (like the actual certificate) and I felt it tested all of the skills required for the 98-364 exam.
uCertify does it with mostly walls of text, but I found that the tests they had after each section and then again at the end covered pretty much everything on the actual exam.