Google provide adwords certification course for Adwords professionals by paying Rs 1000 for their exams.
I don't know about cache but the strange thing is I can not see the impressions in Google website for couple of days back and people do come from google which I have seen in Google Analytics, so something is going on with Google.
I need a Manager to run my ad campaigns daily. Ads, keywords, target, negative keywords etc all is ready. Contact me.
we have promoting one website (http://www.pl999.net) on google adwords , but not mentioned about cetertificate .