I passed today with a 840!!!! Had lots of questions on crypto and IDS. Be sure to know these two items. I used Darill Gibson's book and this book is like a must have for this test. Seems everyone loves this book. Book was very helpful in getting ready. If you struggle with a question, eliminate the obvious incorrect answers (usually 2) and then is much easier.
And don't worry if getting low practice test scores. I wasn't doing very good on practice exams yet still passed. YOU can too!!!