SAT Preparation

<p>So I'm a sophomore and SATs are just about to bombard me in months. Around when should I start studying? Also, what math do I need to know for the SATs? For English, is there any way I could study for the vocabulary and all that? For science, would I have enough knowledge if I'm going to take Physics honors, AP Chem and AP Bio? When should I take my SATs?</p>