Either you can register in java.sun.com or in your near by prometric
center
3.Which exam should I take
scjp1.2 or scjp1.4?
it depends on your interest check how to prepare for more details
How much time it takes to write SCJP?
it depends on how much hard work you put in. I took 1.5 months to
prepare for the exam.
Will the score be displayed on SCJP certificate?
No. it will just say "you have successfully passed" nothing
else regarding your score
How long a Sun Exam Voucher is valid ?
The Voucher is valid for one Yearr
How many attempts can I
make to complete the test?
As many as you want ,there
is no limitation on the number of tests. But you should take some time
before attending it again. check the java.sun.com site for more
information