I AM PREPARING FOR CCNA. I HAVE BEEN READING CCNA EXAM SELF STUDY EXAM GUIDE BY CISCO PRESS. THIS BOOK IS PRETTY GOOD BUT I STILL FEEL THAT I AM MISSING SOMETHING. ANY SUGGESTIONS ON PREPARATION (BOOKS,ROUTER SIMS,PRACTICE QUESTIONS, ECT...) I REALLY WANT TO PASS THIS TEST BY JULY. HELP PLEASE!!