Sounds like a song. Forums are more helpful when you ask a specific question. We assume you don't know about Adwords since that's why you're presumably here.
Go to Adwords learning center http://adwords.google.com/support/aw/bin/static.py?hl=en&page=examstudy.cs&rd=1 After going through all this chapters you can appear for Google Adwords Exam if your are confident.