Sketchy for Micro.
And I'll second the Abbas, but make it his Basic Immunology book (written for med students) rather than the huge Immuno textbook. (If the above poster "read the entire thing easily," he/she is probably referring to Basic Immunology instead of the full Immunology textbook.) You'll also hear people recommend How the Immune System Works, which is a good intro to read in the first weekend or two of class to get your bearings.