Google webmaster tools is a great tool for webmaster to optimize their rank in search engines.
One important feature of Google webmaster tools is “Top Search Queries” data.This link has been put under “Your site on the web” section.The feature shows top search queries when your site appeared in SERP and what position it was having in SERP for that keyword.It also shows queries for that your site appeared in SERP as well as you got hit from that.Also it’s position is included there.
So now what you need to do is concentrate on the keywords for which your site appeared in search engine results page but couldn’t make successful hit.This shows Google knows that your page / site is having something related to the search query but not the exact for what user is looking.
Our aim is to send the query to successful query list. We will try it but after our tries page should not have the keyword bombarding and spam things else Google will decrease rank instead of increasing it. We should go naturally.
You should try to include the keyword in your page title or in your page direct link ( Remember: Changing page link after once making it online is a bad thing,It may create broken links to your site. )
The next try should be including the keyword in post. Best thing is you get keywords from Adwords keyword tool and try to include them very naturally. Not more than two-three keywords per page.
You should bold the keywords. The most important HTML tag of a paragraph is its title,H1 tag but you can not give H1 tag to all words,it will change natural look as well as it will look like spam article.
Though finally rank depends on Google factors like Page Rank , Domain PageRank , Keyword Density and other many things , still it’s an useful thing to SEO.