correction, the PCAT is not very hard. It really depends on the individual, how much effort they put in, and the time in life in which they take the exam.
Example.) My friend tried to get into Pharm School throughout college and ended up taking the PCAT 3 times. Once during their Sophemore, Junior, and Senior years to finally bring it up to a 83%. They were finally accepted their Senior year.
Second example.) I havn't had an intro-Chem, intro-Bio, Calculus, Statistics, or Organic chemistry course in over 5-6 years.... but studied using only the Kaplan PCAT 2010 book + Pearson's 2 online practice exams for 3 weeks and got a 95% on my first try. I'll attribute this to the fact that graduate school turns you into a professional at critical thinking, which vastly improves your reading comprehension and writing style. Trust me, I compared my Personal Statements for undergraduate college, my master's program, and my PhD program and they were all different in quality/style/language choice.
So in total it cost ~$95 total worth of material ($35 for the Kaplan book, $60 for the Pearson Exams) to study. Although the Kaplan book is severely deficient in Calculus and Organic Review, there are TONS of FREE websites that give excellent tutorials on Calculus (e.g. derivatives, chain-rule, etc.) and Orgo.
My advice to anyone studying is to utilize the free websites rather than dumping $300 bucks on a crash course. I understand everyone wants something quick and easy (hence there are those who dish out $1500 for a Kaplan course), but good study habits are developed over time. What might take someone 2-3 months to prepare for, could take another only a few weeks depending on the rigor and determination of the individual.