Nurse Practitioner Schools

I would like to know if graduate school is a nurse physician to serve as a challenging and hard as always, a candidate in nursing? Is there Clinicals and get all the material in such a small period of time? Or is it a bit better because you already have a base of material taught, and you can just move on? Much much harder. You have to actually learn, diagnosis and treatment of disease, type RXS etc. You will learn the medical (not just health), it is very difficult. Actually BSN pales in comparison.