I would recommend doing your ICU rotation first because you will learn learn a lot of practical applications that will assist with your first two tests.
Good luck, NACII makes you work for it! Also, I think all the clinical instructors get together and collaborate on giving the students a reeeeeaaaaallllllyyyyy hard time with the paperwork and care plan guidelines! I can't name names here, but there are a few instructors I would avoid like the plague. PM me for details. Rest over the holiday break because you will get very little down-time during the semester. Seriously. If you are married of have children give them a sit-down and explain to them that you will share your degree with them when it's all over, but for now you will need lots of time and space to FOCUS on survival!!!
So glad I am (almost) on the other side of this freakin' course!!