I never took Immunology

Ok, I did take immunology, but that doesn't mean I learned it!  Immunology was a struggle for me.  I just looked up my grade: 86%  This does not compute.  I knew when I took immunology that I didn't understand it.  I knew what I had to memorize and what I had to do to pass, but I also knew that I barely, and I mean barely grasped even the basics of immunology.  I am reminded of this when I see that immunology is my lowest scoring subject in UWorld with 25% correct and 8th percentile.  Ouch.  I'm trying to go over my notes from immunology, but I don't have any.  Let this be a lesson to those of you who have not yet taken immunology, TAKE NOTES.  To anyone who understands immunology, send some knowledge or suggestions on review books my way; first aid is rather sparse in this subject area as well. :-/