Suppose I have 5 keywords for my website. I want to now what is my SERP rankings for a particular answer , i.e. for a particular keyword on which spot I am in the google search.
There are many free online keyword ranking checker tool. You may consider to try this - allno1 Google Page Rank SERP checker
Google webmaster tools accounts show you this. You can set up a free account and then view the most popular keywords for your site that week and where they ranked.
You also use this tool : www.seoserp.com/web_tools/google_top_1000_serps_checker.asp or rank checker on FireFox.