<p>For chemistry SATII's Decembor, I have Barron's but it's only the 6th edtn. Does the content or format change much in new versions? Are the old practise tests same, or at least, valid?</p>
<p>I have both the 6th edition and newest edition from Barron's. I skimmed through the two and they are pretty similar. I think the 6th edtn has more info than the new one, and there are some differences in their focus, but they are generally the same.</p>
<p>UrsulaXYZ : Really thank you.</p>
<p>Are the practice tests same?</p>