Just came across some interesting information regarding Google and certifications. Did you know that Google won't offer an SEO certification to webmasters? Why??? Because they don't make any money on your performance efforts for organic search engine optimization, that's why.
On the other hand a webmaster can get a certification from Google when there is advertising dollars involved, for example AdWords, AdSense, and Analytics. Read more
I really wish Google would reconsider offering a certification program for organic SEO specialists. After all... organic SEO is the hardest of all SEO to date.