Physics, Chemistry, Biology? Any hope for Dec. SATIIs?

<p>Assuming I'm an above average student in Physics Chemistry and Biology and I have till December to prepare and reach 800-level. Which would you advise me to take, which is easier to perfect and which has the most and least lenient scoring curve?</p>

<p>Also, I'm taking my SATIIs in December and I'm applying to schools this year. Most of the schools I'm applying to have a Regular Decision deadline of January 1st. Would they take my December scores?</p>

<p>Thanks.</p>