I'd argue that if done properly, there's little need to "save" questions, because you'll actually spend more time per session than a simple practice test.
Most people go through questions, see if they got the answer correct and move on, or if they're a little more in depth, will look at why the right answer is right. I'm guilty as charged on going through my MOCA Peds questions this way.
What i would suggest is to turn off the timer for questions, and as you are going through questions stems and answer choices, write out why each choice is wrong or right, then check your work and determine if your initial logic matches up with the question explanation. This provides you with 4x as many data points to review, and in essence you are checking your work to find out not only were you thinking about the question stem correctly, but did you understand why the wrong answers were wrong for the correct reasons. If you correctly identified that an answer choice was wrong, but didn't understand why, then you go back and review that topic until it makes sense. That is all far more time consuming and you'll end up using far fewer questions per study session, get more out of the session overall, and subsequently score better on test day.
Alternatively, there were some sessions that I ignored the question stems completely and simply wrote down everything I knew about each answer choice, then looked up details about each option to see how much or how little I actually knew (or thought I knew), and then corrected what I got wrong in my diatribe to myself. This method ends up not "using up" any questions at all, as you're not even looking at the question, just using it as a starting point.
