I took Enviro 1A03, as well as Earth Science 2WW3. Both of the courses very extremely similar in terms of the course outline, but Earth Science 2WW3 had no labs. I did buy the textbook for both courses, but I have never read them (such a waste of money!). I found that by simply using Google, lecture materials, and common sense you can predict, or get the exact answer to most of the quiz questions. But I've heard from many people that some of his questions come right off the textbook, so it's probably wise to read the textbook, and REMEMBER what you read and where things are since the quiz is 30 minutes. I have done the quiz for both courses without reading the textbook and still managed to get 85% + average in all the quizzes, so it's really up to you. Try doing the quiz without a book (one attempt) and see if the book would help.
Also I've found that in the LAST-LAST quiz for Enviro 1A03 and 2WW3 the second try questions are the exact questions of the first try- so you could essentially get 100%. I would assume it to be the same for Enviro 1B03. Labs kinda depend on your TA, but I think every enviro TA marks kind of easily LOL.
+ This is my fourth course with Bernier, and trust me he will tell you every possible hint for exam, and your usually guaranteed atleast 30-40% of the exam mark! Infact enviro 1A03 even had coloring -_-
That should cover up pretty much everything you need to know