My immuno prof. was awesome, which made me really enjoy this subject. However, I would focus in-depth on HIV-AID's immuno, then be tight on the major autoimmune ds's, and any pharm immune-system mech.'s, etc.
If you go over the blood cells (and stem cell progenitors) plus know the hypersensitive types (1-4) it all sort of comes together too when going over the path for blood and infectious ds. with the immuno.
Hope this helps some, because I am focusing on Path/Pharm/Physio/and Micro - but alot, alot of path study with quick reviews on immuno.
Does this post seem like I'm nervous and a wee sleep-deprived? Haha! I remember seeing a step1 question on the Ig structures (w/ picture and answers "A-E" and choose the area that ?binds Ab?Ag?) and another question on IgM and it being a pentamer. It's been awhile but I only recall 2 q.'s on basic immuno.....