Hi guys! I recently signed up to techexams.net and I have to say-- Im impressed by the place. Informative-- and the forums have activity

I currently have an A+ and a Net+, with my last CompTIA going to be a Security+. I have read all of the All-In-One Security+ Certification Book (Learnkey) over a month ago and have been doing study questions since then. I'd estimate I've gone over 200 questions with 80-90% accuracy.
Getting to the point-- can anyone offer any advice for additional study material? Any hints for taking the test? When I passed the A+ Core Hardware/Software and Net+ I didnt hit 700s+, I ended up with high-mid 600s, which wont cut a passing grade on the Sec+.