I have already selected Manorama year book 2012 which other should i add?
Best GK books!
W
first be clear about what do you mean by GK.GK as such is very wide & divided into many sub-areas.mention the intended usage of GK(exam,aptitude,personal learning etc) to get appropriate suggestion.
It's for a inter college quiz competion
the book of Wikipedia? /trollface 
^^ Lol..Year book surely
Then will use search engines
what all topics to search 0n?
PM'S of the world?
largest stuff in the world?
current events?
the worlds most corrupt goverment ?(no need to search that)
Then will use search engines
what all topics to search 0n?
PM'S of the world?
largest stuff in the world?
current events?
the worlds most corrupt goverment
?(no need to search that)
the worlds most corrupt goverment
yes you need to.. you might be just surprised
W
year book should be enough assuming questions are to asked based on current/recent happenings.if questions are of type who invented this?,which is biggest/smallest? etc then ask at local bookshop(usually frequented by competition exam candidates,ask around for info) & ask for some kind of fact book.