I am presently preparing for java1.4 exam, but I heard that people are going for java5, caz it is the latest. Shall I change my decision and should prepare for java5? or continue with the same? How many more concepts are added in java5?
I recommend taking the examination for the current technology (i.e., 1.5), as it will (likely) remain applicable for a longer period of time.
Also, please make the extra effort to write out words such as "because". The extra keystrokes won't cost much in the way of time, and the enhanced clarity will be appreciated by those communicating on a forum with international readership.