<p>So I took that Chem test in May and I failed miserably (IDK why though..I got a 770 on a Princeton Review test and a 730 on a Barron's test but only got a 670 on the actual test). Since, I'm taking the actual SAT in June, I'm retaking the Chem Subject test in Oct. Because it's such a long time away, when should I start preparing? (I'm in AP Chem so it should not be too hard for me).</p>