Flok

There are so many questions between the mock exams and study material providers that you should NOT worry about running out of questions. If you're in a situation where you know how to do all the problems on every sample exam, even if it's because you remember how you did them before, then you're in good shape (I'm not talking about remembering the answer is C... I'm talking about remembering the trick or method to work the problem). I would definitely not recommend waiting until the last minute to do mock exams. The only reason I can see saving one for the last minute it to practice under time constraints. However, time was not a constraint on level one (during the December sitting I think most were done with 30-45 minutes to spare for each session). That may change for this setting - nobody knows that except the CFAI at this point.