Has anyone used the Security+ book offered by CompTIA Press to pass the exam? I've taken the exam twice and have found the material in the test frustratingly different from what is offered in the materials I used to prepare. I missed the cert by 4 questions the first time using the Sybex book and missed by 2 questions the second time using the Exam Cram book. Any and all suggestions to help me pass this exam are welcome!