site to refer for GK.....

1. http://www.gktoday.in

2. http://www.indiancurrentaffairs.blogspot.com/

Best site to refer in preparation of exams are...

1. this is very good blogspot . very inspirational must visit to start with
http://upsc-prelims.blogspot.com/

2. Next one is ...
http://www.civilserviceindia.com/

3. http://upscportal.com/civilservices/

4. http://examrace.com/default.aspx

5.