Did Not pass Security+ prep for re-take

in Security+
I just took the Sec+ this week and did not pass it with a score of 685. Very disappointed in myself as I work in IT and studied on/off over the past several months. Not sure where i went wrong. I did the CBT Nuggets (Keith Barker), the CertMaster Comptia, various books as well as Professor Messer. I was not prepared at all for the SIM questions and those caught me by surprise. I do have a copy of Darrill Gibsons Get Certified Get Ahead in PDF format but did not take the opportunity to read and or follow his study links. Could someone chime in, if that was a mistake and also any advice on how best to prepare for the sim questions that came at the first of the test? I thankfully bought the Deluxe package so I have a free re-take which i plan to do next month. Just really disappointed in myself as truly believed I was going to do much better.
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Upcoming Certs: VCA-DCV 7.0, VCP-DCV 7.0, Oracle Database 1Z0-071, PMP, Server +, CCNP
Proverbs 6:6-11Go to the ant, you sluggard! Consider her ways and be wise, Which, having no captain, Overseer or ruler, Provides her supplies in the summer, And gathers her food in the harvest. How long will you slumber, O sluggard?
When will you rise from your sleep? A little sleep, a little slumber, A little folding of the hands to sleep, So shall your poverty come on you like a prowler And your need like an armed man.
Yeah about the acronyms, for some reason it's a big deal on exams. If you purchase the Darril online study package, it has flash cards that help you remember important topics for the exams. He also has some sim questions. Maybe that would help.