My school finishes biomedical sciences in the first 12 months of the program. The last course wrapped up in August and we had to take a 150 question mock-INBDE for which all biomed course content from the previous 3 semesters was fair game. Half of the questions were basic science, and other half were patient boxes.
That's all we've had so far, but quite frankly we are out of the loop for the INBDE. Most people seem to be taking it in Fall of D4. I have no clue how we are expected to carry over the basic science knowledge that far.