Is there a benefit of doing all three Adwords certification exams when you only have to do two? Is there a?

[Phillip]

I agree with the other answer, many of the exams are really easy to pass meaning they're not really worth anything and experience with real world means the most.

However if you are looking to grow into the area, say you've done fundamentals, display and search, it is deficiently worth studying for the analytics one if you feel you are weaker in that area.

Otherwise the certified individual achievement only requires fundamentals and search. So you don't get anything else for doing them all.