Well, i think one edition or two edition behind will be ok to use as a reference for studying the exam. Anything more than 2 editions behind may not be as effective because information or strategies might have changed and some methods or questions are no longer applicable to the exam.                  	                  
                  
                
                  
                   
					 
					 Mary
             
                  	Mary
                    Posted on: 08-Feb-10 
                    
                    (Post #1)