I bit the bullet ! My only chance to sit this exam is Monday for the entire month, not what I had hoped as wanted 2 weeks cramming but you can't get much more motivation to succeed than booking in like that

I have been using prowse book with 1 chapter remaining, most nervous of encryption as I only got 68% of the 35 practice questions right although I have since identified why I got them wrong, again I stress to anyone out there TAKE TIME READING THE QUESTIONS. Most others I am around 80-85%
I am really unsure about how these questions will weigh up against the real exam tho, I am in the mind that they are helping me understand the content tho.
I am extremely nervous of any questions that may involve cmd / shell simulations as I am not sure what I could be hit with.
Background: A life of working around PC's either from home or in retail, with a background in hardware engineering in 2001.
Currently 2nd year as a service desk technician after moving continents and getting back into IT working on incident management and request fulfillment in an enterprise environment.
If anyone can offer some insight into the simulations or "make sure you truely grasp this concept" It would be much appreciated.
(I also have been using the android certmaster app from comptia)