You can't beat the Dako IHC info from their site: http://www.dako.com/us/08002_ihc_staining_methods_5ed.pdf This was my main source of information I used while studying for the exam. Also, look into IHC for cytology prepared specimens online. I had a few of them pop up on the test. Hope this helps! Good luck! Joshua Wray HT(ASCP), QIHC