According to Google Webmasters, I rank for particular keywords at some Position but when I checked in Google and with Some SEO Tools, I did not find the site anywhere. Is it really reliable?
yes it is 100% reliable may be u must delete cookies and logout from gmail and check now in google search results whether your result getting or not
This thing happens to me too. I believe that the keywords that they show in webmaster tools are only available for some search engines (google.es, google.ca etc) depending your location. Second, the data that you see on webmaster tools is not updated daily.
The data is reliable but there are better ways of tracking you rankings. What I do feel GWT is very good at though is reporting backlinks, it certainly has fresher data than most of the paid tools that scrape their own index.
inface its one of the most accurate monitoring tool available on internet ... plus we use google services so we should trust their products ...