4 years back i studied jdk 1.3 and have books related to that versions also like Khalid Mughal and of Certification Java 2 study guide etc,i planned to do SCJP and visit this site but now confused seeing 1.4 and 5.0 versions,i didnot work on these and should buy more books.. can any one guide me what should i do!
As you've discovered, the 1.2 exam is no longer offered, so your choices are 1.4 or 5.0. (There was never an exam for 1.3.)
If you feel pretty confident using 1.3, then you might consider the 1.4 exam. As our SCJP FAQ indicates, the difference between the 1.2 exam and the 1.4 exam is nowhere near as significant as the jump to 5.0.
On the other hand, if you're starting fresh with exam preparation, then I would encourage you to aim for 5.0, because it has a lot of valuable new features and is the most current.
"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer sscce.org