First Year and Second Year:
It starts with 11 weeks of Anatomy, split over three divisions. One hour lecture in the morning, 3 hours in the lab. Each group of 5-6 people are assigned to a personal cadaver they will keep throughout the entire session. One test every 3-4 weeks, noncumulative. 50% written, 50% identifying parts from each the cadavers.
After anatomy, you have Divisions, which last 3-4 weeks. Usually 3 lectures in the morning 830am-1130am. After each division is an exam. Written exam 80-120 questions. Passing is 70%, there are no letter grades. The Divisions go by organ system, such as the GI Division, Pulmonary Division, Cardiac, etc. Sometimes, some body systems require multiple divisions, such as Cardiac 1, Cardiac 2, etc. The longest topics were Neuro(4 Divisions), Cell(3), Host Defense(3), Anatomy(3), Cardiac(2). Other divisions include: Endocrine/Nutrition, Reproduction. etc.
Grading is strictly pass/fail with 70% being the minimum. However, your residency directors you apply to will find out what quartile(top 25%, middle 25%, etc) you are in.
Alot of important topics are taught twice during these 2 years. For example, diabetes is covered in GI(pancreas) and endocrine(pancreas). This is planned and deliberate redundancy.
There are NO final exams. No tests are cumulative. The Step1 is basically your final exam and occurs after your 2nd year.
Starting at the beginning of Med1, you have something called CAPS class that meets once a week for 3-4 hours that ends at the end of Med2. This is graded separately from the regular curriculum, and you must pass CAPS to advance to the next year of medical school - I don't think anyone fails CAPS. This is not a science class, but rather a physician development class. It involves understanding problems like addiction, talking to elderly patients, talking to minority patients, how to conduct a proper history/interview, etc. You get tested periodically by taped history/physicals on a model patient in the Clinical Skills Lab, located beneath Prior Library.
Med1 lasts mid-August through Mid June. Med 2 starts Mid-August through April. After boards in June, Med3 starts in July and goes 12months year-round after that.
Right before 3rd year starts, you take ICM, Introduction to Clinical Medicine - a quick 2 weeks session that introduces you to life on the wards.
During the 3rd year, you start rotations. I am not too familiar with how it works. But I know you rotate through Pediatrics, Surgery, etc in 6-8 week blocks. You can pick the order of your rotations, so people usually place the rotation they want to specialize in LAST in the year so they can be more experienced and do better in it when going in. The different rotations at different hospitals have reputation for being easy/hard, good/bad etc. For example, people who want to specialize in radiology do it at OSU, whereas people who aren't interested might want to do at Riverside if it has a reputation for being easier there.
You can choose to rotate at multiple hospitals in the area - Nationwide, Riverside, etc. The evaluation method depends on the rotation and where you rotate - it could be written exam, SHELF exam, oral exam, a general evaluation, etc.
The fourth year is considered very easy. You also some rotations to do, and you have elective rotations your 4th year, which you get to pick certain rotations that interest you. You get many off weeks to do interviews for residency, and you have opportunity to do away-rotations out other hospitals in the country, which you independently apply for. Everything I heard from 4th year is that it is short and pretty straightforward.