i want to right google adwords exam can anybody share their experiance about google adwords exam Please tell me the advantages of writing that exam.
If you are talking about taking the exam, then the main benefit is that you can call yourself an "Adwords Qualified Individual". You get a link that you can put on your website which confirms your status.
The biggest benefit is that you get the absolute basics covered. It forces you to learn the "boring" parts of AdWords. Also, as custartmite said, you get a fancy little logo to use on your website. We are a qualified company (one of only 4 in our country) and have been told by clients that being a qualified company was a main factor in choosing us.