I discovered Dr. Najeebs video while in the program, honestly, it was way too late for me. I have made up my mind to make the most of my situation by studying alot ahead. Listen to entire video for Dr. Najeeb especially in Neuro and Respiratory. This were the hardest chapters in Guyton. Goodluck but CRNA school is no joke. If you have a lot of responsibilities before school, take care of them first.