<p>Our S's school is different. There is only biology, either regular or accelerated (usually taken as a freshman) and then AP bio which can be taken junior or senior year. Most schools I know are structured this way, although I'm sure there must be some like yours also. My S took the SAT II after bio accelerated freshman year (there is a choice to take the molecular or environmental section - I believe he took the environmental) and did fine.</p>