I find that after a good 2 days of hardcore reading, I'm able to score well on these practice tests (NBME, Kaplan, USMLEWorld). However if I take days off, or just do questions all day... the information starts leaving my head. Maybe its because new information is pushing it aside.. In conclusion, I think the best thing to do is to not put too much unnecessary info into your brain, because this tends to push out some necessary info. Or, you could just repeat information over and over ad nauseum, and this tends to make it stick... It must have to do with neural connections not being solidified, therefore "if you don't use it, you lose it." Anyone else, care to comment or have similar memory issues? Man, I wish I had a photographic memory!