"The duration, scope and rigor of the MCAT makes it difficult even for academic overachievers. Med school admissions experts say premeds who have received good grades in college shouldn’t assume that they can easily achieve a high score on the Medical College Admission Test, or MCAT.
The MCAT is harder than a traditional college test, partly because the MCAT is a comprehensive, interdisciplinary exam that covers multiple science subjects, such as biology, physics and chemistry. In addition to testing scientific knowledge, the MCAT tests verbal skills by requiring premeds to read and interpret social science and humanities passages.
The MCAT is also much longer than a typical college final. It lasts approximately seven and a half hours for test-takers who use the optional breaks between various sections of the exam. Experts also warn that the test is more of a marathon than a sprint and that achieving an exceptional MCAT score demands intellectual endurance." …