Reddit mentions of Sales and Service for the Wine Professional

Really just read http://www.amazon.com/Sales-Service-Professional-Brian-Julyan/dp/1844807894/ref=sr_1_1?s=books&ie=UTF8&qid=1376364168&sr=1-1

It's what the test is written from and the practice test in the back is essentially the level 2 exam. Use this for level 1 and this plus a few others for certified and you'll be golden.

When you sign up for the Level I course, you'll receive a copy of Sales and Service for the Wine Professional by Brian Julyan. Much of the Level I course will be taught from this book, so it will be helpful to familiarize yourself with it.

I'm a big fan of the World Atlas of Wine by Hugh Johnson and Janis Robinson, since it focuses on regions and appellations and explores wine from there. Great for getting to know the smaller sub-regions that you'll be expected to know for future exams.

I also have a copy of the Oxford Companion to Wine by Janis Robinson. It's more of a reference manual than a book you can read straight through, but if you come across a term or a region you're unfamiliar with, this will be a great reference.

I also recommend Karen McNeil's Wine Bible and Wine for Dummies for a more conversational, digestible overview of wine. They won't delve too deeply into the Master-Level details, but for Levels I and II, they'll help immensely.

See this link for the Level I syllabus and recommended reading list from the Court of Masters. Hope that helps out. I took and passed Level I about two years ago, and will be sitting for Level II this year. PM me if you have specific questions about the test. Level I is pretty easy if you've been working with wine for a while, so October/November should be an attainable goal.