Rich,
I understand that being honest about my background is essential to get the best advice from you and all the other experts on here. I do appreciate the expert advice because hey, that's exactly what I am here for. I am not trying to waste anyone's time. Sorry if I came across like I were.
What I meant with having not studied math in the last 5 years I meant that I have not had studied math consistently (or even semi-consistently) in the last 5 years. The rules and formulas are very easy to forget without visiting the topics on a regular topics. "Essentially no math in the last 5 years" to me means that there has been no consistent, structured practice. The way I got the Khan Academy points is not necessarily the best way to actually retain the things I've learnt, but just to do some stuff when I was bored.
The Khan Academy points have been gained in a couple ~2 week bursts where I just did quizzes for things like pre-algebra and basic arithmetic with maybe some geometry sprinkled in and re-did the same topics a bit later with maybe a new topic incorporated in for good measure. I am bit of a completionist so that I have to have everything from the start marked as done so in the end I have a nice, clean row of "completed" checks from start to end. You can get points by re-visiting old topics and "mastering" them again and again. Literally elementary grade topics.
Now that I think about it, I am not sure if it's me or if it's just the way that I studied Khan Academy, I don't retain the math topics that well at all. Sure, when I started studying for GMAT I knew how to do basic algebra with adding and subtracting, but for example when you involve fractions and multiplying, I had to consult the Foundations of Math book. Same thing with basic rate problems like "Matt can do 3 problems in 10 minutes. Dave can do 20 in 1 hour. If they both do problems, how long does it take for Dave and Matt to do 50 problems?" are easy because you can just think it through, but whenever it gets more complicated than that I get lost.
The practice exam was a full-length CAT with the AWA and IR at the start. I took two 8 minutes breaks, one after IR and one after quant. Ate a snack, did some push ups and got back to work. No pausing at any point. I took it at home.