Last week I passed the SCJP exam with a 90% score. I went through the book of Kathy Sierra & Bert Bates, and that was a very good base. And I did do a lot of mock exams, I liked the ones from Marcus Green, javacertificate.com and enthuware.com. The fun part is that two of my colleagues are also studying for the SCJP and they want to have a higher score than me. Thanks javaranch for the great info!
Way to go! You know, I've always found that I learn things even better when I teach someone else. Teaching your colleagues might be a great opporuntinity to expand your knowledge just a little bit more.