It is a difficult test but if you have high risk experience that will help. I studied with the 2007 version of the Manual of Obstetrics, but a new version came out recently. It's much less overwhelming than a textbook and was very helpful. I have a feeling the strips won't be a problem for you, I don't remember there being many. Brush up on epidurals/anesthesia and other things you aren't currently dealing with. Your antepartum knowledge will help you too. Good luck!