<p>I haven’t used Sparknotes, but I’ve heard it’s extremely difficult compared to the actual exam. You can get an 800 on the real version while only getting a 690 at most on the Sparknotes version. I recommend using the Barron’s SAT II Chem book, it’s very thorough and although it has additional information that probably won’t show up on the exam, it will help you prepare a lot. It’s also more difficult than the actual exam, but not as difficult as Sparknotes.</p>