If what you hope to achieve is a Master's of Divinity degree, then you at least will not have to concern yourself with mathematics (i.e., trigonometry, calculus, et cetera). I have been told that it's very much like a philosophy course, in that the final dissertation need only be defensible to be deemed "correct" (although you will likely have to also steer close to the school's official doctrine). Just brush up on your apologetics, your homiletics, and your basic Bible knowledge, and you have most of it covered -- the rest is mostly attendance and participation.