<p>get the 7th edition of campbell's. you can get it new for around $100 from online dealers through amazon. just make sure they have good ratings.</p>
<p>The green book is the 7th edition by Campbell, Reece. it's also amazing. At the end of every chapter are questions that are as hard if not harder than the AP questions (i've taken the test before and yeah those questions were scarey compared to the AP test). I know you need the textbook and not testprep, but 5 steps to a 5 is modeled after the Campbell Reece book (almost all the pics are from Campbell) so the crossover is helpful and the explanations are really down-to-earth. It hit on everything that was important for the test. Between those two, i had everything i needed to do really well on the test.</p>
<p>The 7th one is the red one :) Go to <a href="http://www.campbellbiology.com%5B/url%5D">www.campbellbiology.com</a> to see all additions. I used the Barrons how to prepare for the AP Bio exam and cliffs.....cliffs is PRETTY DARN good! good luck...the exam isn't that bad. just don't stress nor procrastinate..and youre doing really well on the latter.</p>
<p>cliffs is pretty well modeled after campbell's too. i liked cliffs a lot - not too little information but not so much that you get bogged down in 'review'</p>