All medical schools require students to take the MCAT. It is now a computer-based test, offered on dates between January and September of a given year.
Some students choose to take a commercial test-prep course from a company like Kaplan or Princeton Review. Others study independently, or with an informal group on campus. The choice of methods is largely personal, and the important question is how you will best prepared, being honest about your own discipline, time constraints, and background knowledge.
The MCAT has four sections: Verbal Reasoning, Physical Science, Biological Science, and Writing Sample. The first three sections are scored on a 1-15 point scale, with a curve so that the mean is near 8. The Writing Sample is given a letter grade (and generally ignored, unless is it very low).
Scores of 10 in the numerical section are at once very good and adequate for virtually all medical schools. Combined scores above 35 are exceptional. Few students consider retaking the MCAT if they receive a 30. Most students who do receive a score below 30 or a section score below 10 should consult with the advisor to discuss a retake.
The MCAT should be taken after the core science courses are completed and (ideally) in time to receive the scores before submitting the common application.
Reference and practice material is available in the HP office for short-term loan.