I passed today with 85%. Didn't spend a penny on commercial softwares!! :P
1. Score 100% compulsary on javaranch Rules round up game .
2. Preparation- Answer only the review questions at the end of each chapter from khalid mughal scjp 1.6 book. It shows many new tricks, which you might have missed!!
3. Use free ExamLab software by Devaka Coorey. - Give 3 exams
4. Reread the kathy sierra book's 2-minute drills, until you have concepts crystal clear!!
5. Don't waste time giving mock exams, if you make the same mistakes again & again, reread that objective from kathy & sierra, till you can apply those concepts in code.