SCJP exam

hi all
I am Saman From Sri Lanka ,
Pleas send me following information

I am preparing for SCJP, what are tip and study techniques,
I obtained this Certification is it valid for life time or some time period
in this eaxm there are two version which version (1.2 or 1.4 ) is easy and which version is valuable or both are same
thank you
send samanzone@yahoo.com

Saman,
Welcome to Javaranch, a friendly place for Java greenhorns

Please go through our SCJP FAQ where you will find answers to most of your questions

Also please find some useful resources below:
Objectives:
SCJP 1.2 objectives
SCJP 1.4 objectives
Specification:
Java Language Specification 2nd (JLS)
Official Java Language Specification Errata
Unofficial Java Language Specification Errata
Mock exams:
Maha's site
Javaranch mock exams list
Marcus Green's web site
Jiris e-Learning System
Dan Chisholm's web site
JDiscuss' mock exams list
Valentin's mock exam
Hints:
Sun Certified Java Programmer Pre-Exam Essentials by Dylan Walsh
Free Java lessons
The one thing I wish I'd done... by Kathy Sierra
Traps to be aware of in any SCJP test !!! :) by Maha Anna
5 days before the exam. Any last minute stuff I should look out for?
Top Ten Errors Java Programmers Make
Preparation tips by Maha Anna
Manish Hatwalne's Revision notes
Don't forget our Sun Certification Results forum where people give some feedback after taking the exam.
Also check out the Javaranch's newsletters which contain very useful information.
Articles:
100% Certified Java Coders: How To Get Certified by Michael D. Meloan
An SCJP 1.4 certification primer by Pradeep Chopra, Whizlabs Software Ltd
You said "Certification"? by Valentin Crettaz
Other interesting articles
Test engines:
JQ+
J@Whiz (SCJP 1.2)
J@Whiz (SCJP 1.4)
JCertify 6.0 (SCJP 1.4)
JCertify 5.0 (SCJP 1.2)
Books:
Javaranch bunkhouse
Other info:
SCJP FAQ
Position on Real Questions - Must Read!
Other people's results
Good luck