<p>I have gone through Barron’s, PR, CliffsNotes. Personally, I’d say CliffsNotes is the easiest to follow (although the syllabus is covered with adequate depth) - But you would want to consider Barron’s ONLY for the practice tests. They’re a tad bit difficult but help you quite a bit. PR’s AP Biology is good, but not excellent like Cliffs & Barrons. </p>
<p>Also, do the tests of 5 steps - they are pretty accurate</p>