Doubt about ipcc-law,ethics and communication

Hi..i am following IPCC- Law,ethics and communication book of Munish Bhandari sir...its an edition of the year 2011 where amendments upto 1st may,2011 are included..i am also having the amendments which were and are applicable for may,2012 and november,2012 IPCC exams, respectively..my question is that are my old edition book  and amendments equivalent to the latest edition book?or do i have to study from the latest edition?please reply...