I agree with Mathcod's thoughts, but I'll add, every person is different in how they learn, retain, and recall information. If you want to start creating little tabs for yourself of things that seem important, which you want to remember to revisit, you might choose to do so.
In my case, I began reviewing for N.B.E.O., I one month in advance; II, a few days in advance (and, sloppily so...); III, by practicing with fellow students a few times, and by preparing a rhythm in my mind of the official required points.