A Google AdWords Help thread asks what do you need to score in order to pass the Google AdWords Professional exam?
There are two exams:
(1) Google Advertising Professionals Exam (2) Fundamentals and Search Exam
The first one, the Google Advertising Professionals exam needs an 85% score to pass. Whereas the second one, the Fundamentals and Search exam needs an 80% to pass.
AdWordsPro Sarah explained in the thread:
I checked with the people in charge of the Google Advertising Professionals Exam and it looks as if the passing score for the Fundamentals and Search exams are 85% and 80% respectively.
She then added that Google will adding more practice quizzes about the April or May time.
Forum discussion at Google AdWords Help.

Comments:
Bryan
11/25/2009 05:46 pm
I'm not sure this is correct. The team at our agency all passed the Google Advertising Professional Exam and the results noted the minimum passing score is 75%
diarmuid ryan
11/26/2009 11:50 am
we are currently in the prcoess of undergoing these exams, it would be nice to know what to aim for
Marcel Heinkens
11/28/2009 11:01 am
I just took the Google Advertising Professional Exam (and passed :-), the minimum passing score is 75%
Alex
12/16/2009 09:50 pm
Sorry, but you are wrong: The pass score for new 2010 GAP Exams which can be already taken by several companies (including ours) is 85% for Fundamental and 85% for Advanced Search Part. My first attempt 10 days ago was 83% and I FAILED and yesterday I passed Fundamental part with 93%.
Alex
12/16/2009 10:25 pm
nope. It is 85% for new GAP 2010 Fundamental and 80 for Advanced parts. 120 questions - 120 minutes. had my 1st attempt 10 days ago with 83% - FAILED. Yesterday had 94% - passed.
ro
02/03/2010 09:01 pm
i just took it earlier and got an 81 thinking a 75 was passing. were the questions similar the second time around?
No Name
07/08/2010 07:52 pm
85% for Fundamental and 80% for Search Advance.
Jerold Hawkins
07/16/2010 12:55 pm
85% to pass the google adwords fundamental exam 80% to pass the advanced search advertising exam both or one of the other advanced exams are required to officially become google adwords qualified. definately worth it!
Pavlicko
10/31/2010 09:48 pm
Woah. the advanced search exam was a beast. lots of tricky questions there. used ALL of my time on that one. Passed them both, though. phew.....
No Name
10/31/2010 10:37 pm
Yep. 85% Fundamentals and 80% Advanced. I just got 80% in the Search advanced exam and that was a pass. I'm thankful it is 80% too because there were a bunch of questions about Adwords API and I never use the API.
Courtenay Probert
08/16/2012 12:10 pm
The latest scores for passing the Google exams can be found at: http://support.google.com/adwords/certification/bin/answer.py?hl=en&answer=167880 I had to look them up today for the Adwords exam simulator we're building at http://www.ipassexam.com :)
Dario Petkovic
02/20/2013 03:00 am
I got 82% out of the 85% minimum passing score for fundamental exam - bugger! 2 hours for 96 questions and some questions were very tricky in my opinion
Eugene
05/30/2013 01:48 pm
Hi! If you're interested in testing yourself in Google Fundamentals, you can try http://teachmegood.com. Its affordable and gives a good example of what the actual Google exam will be like.