I appeared for the SCJP1.4 exam last week and passed with score of 80%.
1.Javaranch is the best ! I didnt refer any other site other than javaranch.
2.I was consistently scoring 75% in Dan's mock. Thanks Dan ! it is a challenge to score higher in your mocks.
3.I took marcus green exam just 2-3 days before the exam and scored about 85+%.Thanks Green !
I had atleast 12 questions from the Threads

I think the test takes one section and tests you aggressively. So watch out guys ..you never know which section will be tested. It could be java fundamentals

or Threads

.
Thanks for all the helping hands !