For me, the hardest content areas were the program planning and the more Type 1 related questions like insulin pumps and correction doses. (YMMV).
It's all multiple choice and a lot of the questions were set up as - choose the best answer, and there were two wrong choices and two correct choices. Like "which one should you do first?" and you had to guess which one of the two correct choices they think you should do first in their hypothetical scenario.