There's no calculus... and I think there's a LITTLE bit of micro bio in the general bio section. But, not much. It would basically be whatever's covered in freshman bio. You can check the front of any OAT review book to see what kinds of things are covered in each section.
Make sure you've had: Physics, Organic (both semesters), general chemistry, two semesters of freshman bio (plus ecology and evolution), the only other sections are reading and math. The math section is mostly algebra based stuff.
Hope this helps. Feel free to chime in if I missed something guys!