My advice to you is not to go for Yahoo ranking, as it is not as successful as Google. Concentrate on Google and its search engine Bing, which is the best and has visitors throughout.
I really think that in spite of the fact that Google good ranks could get you a long way, there is still that need to be getting access to Yahoo rankings.
Page Rank has become an important factor for websites in the internet market. You can use different types of SEO techniques for capturing high ranking on SERPs.