So I've been studying CCNA Sec for a couple of months and thought I wasn't too far off being ready for the exam so decided to get the Boson practice exams boy was I in for a shock! Is it just me or is the Boson questions really hard? I feel I am missing large gaps in my understanding of different areas for the exam. But when I was reviewing notes before doing any questions I felt I really understood most of the stuff.

I used CBT Nuggets, the OCG and just started 31 days before along with the Boson practice exams.
Anybody else experienced this while using the Boson practice exams?