OK. The 200-600 is a raw score, right?
If so, then a 300 means you got 25% right. Someone PLEASE correct me if I am wrong.
Have you tried a practice PCAT through Pearson? That will give you an idea of how you will do.
What classes have you taken? You should do OK if you have taken Freshman Bio, Gen Chem, Calculus, and Organic 1 (I am currently halfway through Organic 1 and did not miss an Organic question on the practice PCAT so I am guessing it does not really cover Organic 2). You also need to have decent verbal/reading comprehension but I think if you did fine on your SATs (since you are in 0-6 I assume you took the SAT no more than 2-3 yrs ago) you just need to review what kinds of questions are on the PCAT and how they like the essay portion structured/written.
I honestly think if you have decent grades so far and have taken the material that the PCAT covers, you should do OK.