Which is more difficult, TEM-8 or Cambridge Advanced Business English Test?

TEM-8 is not easy to test, and the content of BEC is business, which is more professional than TEM-8. The emphasis is different.

I suggest you think about the main purpose of taking these two exams, and then if it is difficult, I suggest you go directly to the internet to do the mock exam and do it, so that you can be more clear.