I have heard that the immuno section of LANGE micro is good, but haven't used it myself.
What I did is read the corresponding chapters from RR and ofcourse FA.
Those CD markers and receptors are very HY, as per the current exam experiences.
Immuno section of Lange is pretty good, but if your understanding is ok or average FA immuno section is good enough. If you are absolutely weak or your school never thought it then "How the immune system works" will be a good start, its also a small book and fun to read.