Barron's Chemistry-Need previous SAT II takers

<p>Hi, I am reviewing the book and was wondering if anyone with experience with the SAT II Chemistry test would be kind enough to suggest for me what to omit from the reading.</p>

<p>I have read that Barron's is slightly overkill and would like to follow the 80/20 rule to get the most out of the reading, not to get the very very specific question right.</p>

<p>Thank you.</p>

<p>What is the 80/20 rule??</p>