I just recommended the link below:
Adobe Certification Exams | Adobe Training & Certification
in the other thread - Photoshop CS6 ACE exam
It's best to not write multiple posts that cover the same questions.
To your question on adobemarketplace, yes it is trustworthy.
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Having written these oh too many times, I recommend the following for your prep:
- Download the ACE Exam Bulletin from here. Photoshop CC 2015
- Download the Photoshop User Manual from here. Adobe Photoshop - Adobe Support
- Work through each of the topic areas in the bulletin thoroughly.
- You will need to do some research on some topic areas by way of google and forum searches.
- Work through each of these in the application and make sure you understand them.
I've tried a couple of these Exam Aids and I found this method worked best for me.
Isn't Photoshop CC also retired?
The latest ACE exam you can sit is CC 2015.