University of Science and Arts of Oklahoma
The MCAT (Medical College Admission Test) is a "standardized, multiple-choice examination designed to assess the examinee's problem solving, critical thinking, and knowledge of science concepts and principles prerequisite to the study of medicine. Scores are reported in Physical Sciences, Verbal Reasoning, and Biological Sciences."
A free practice exam is available from the Association of American Medical Colleges (AAMC). Don't be confused by the shopping cart. You have to "order" the free exam but it doesn't cost anything. Other practice exams are available to purchase.
The AAMC also provides some introductory adives on its What's on the MCAT2015 Exam? page.
Kaplan offers multiple free test prep resources, including practice questions, test prep classes, and a practice test, all offered online. Most are offered at specific times; you will have to create a count and register for a particular test practice session.
Premed HQ offers lectures, notes, questions of the day, and full-length MCAT practice tests.
The Princeton Review offers a free MCAT practice test. Don't be fooled by the shopping cart interface. The cost is still $0.00.
Examkrackers offers MCAT study guides for biology, physics, chemistry, organic chemistry, verbal reasoning and math. The study guides are on reserve in Nash Library.