Useful link to study for Adwords Certification Exam:
- http://support.google.com/adwords/certification/bin/static.py?hl=en-GB&page=examstudy.cs&rd=1
- http://www.ipassexam.com/
- http://googleadwordsmockexam.com/category/sample-questions/
- http://googlecertifications.com/?p=1
