I highly disagree that it will not help. If anything, having exposure to the material is really helpful.
As I said before I highly recommend you look over immuno/microbio, and hematalogy this summer. Do not go over BRS anatomy or RR biochemistry or anything like that.
Just review the anatomy and biochemistry which is present in Kaplan medessentials and FA, and start looking at immuno/microbio in Kaplan Medessentials and FA by accompanying it with kaplan lecture notes or Micro Made Ridicolously Simple if you have not had these courses all ready. Most in their M1 year havent, so doing this plan ensures that you have reviewed M1 while preparing for M2 and the boards.
Dont worry about physiology, as you will have multiple repeated exposures to it during M2, as well as you'll have to review it in depth down the road anyways.
If you have time and money, then buy the Kaplan qbank and start practicing questions on there.
It would be best that you buy now Kaplan Medessentials and FA if you all ready havent done so. Its a very worthwhile investment, that will need to be purchased anyways end of 2nd year, so why not now.