The ACE exam is written by ACE
Just know what the ACE people want and then give it back to them. For example, don't always answer a question based on how YOU feel, but how the study manual states it.
For example, ACE says DON'T USE SUPPLEMENTS, THEY ARE A WASTE AND INEFFECTIVE. Well I personally feel that there's some supplements you CAN benefit from. But if you answer that way you will get the question wrong.
I wouldn't say the ACE certification exam is easy, but if you study hard you'll be okay. The tricky thing is, on some questions you'll have 4 answers to choose from and 3 of them are right, but there's only ONE acceptable answer, so take your time and ask yourself what answer ACE is wanting, not necessarily what is correct.