Hi there.
I started PRing at the start of my second year at med-school. I haven't mastered it yet but I'm slowly getting there. But what i will say is that I've found PR to be an excellent tool for med-school because:
1. As you approach info non-linearly you get a much more integrated overview and so understanding of the subjects.
2. As you read several different texts on the same subject, PR helps you selectively zoom in on the areas you haven't come across before.
3. Because PR is an active learning system (you set your learning agenda) you can spot issues that are often 'side stepped' in the text more easily (so you look boffy 
).
But what i will say is though, don't try to learn to PR on med-text books they're way too complicated for a beginner (trust me-been there). Also don't save it all up for the exams.
One last thing, I tried to PR in the 1st semester, was doing a lot of things wrong but still managed a respectable pass (and half the year failed)
You gotta make your own mind up.
All the best!!
Nick
