I recommend that you attend an HRCI exam preparation course - I did this, and I felt it was very valuable. I also recommend that you take advantage of every single study guide and tool that HRCI provides, and don't wait until the last minute to study for the exam.
One unique thing I did to prepare for my SPHR exam (this was back in 2001) was to record myself reading the important content and quiz questions in the HRCI study materials. I then listened to that recording over and over and over, to and from my work location (this was before I started my own business) because I had a long commute. In this way, I was able to use my long commute as a way to study! I felt this really helped me to pass the exam on my first try. Good luck!!