If you are in the USA, I wonder why you would like to ask if you could take the test from nepal. Anyway, I prefer California if you are BSN because they are faster and their process is easier to understand. You would not want to go with CA if you do not have BSN because they will make you take extra classes. You do not necessarily need CGFNS. You need CGFNS for visa screening for green card processing or if your state board of Registered Nursing requires evaluation from CGFNS. California does not require that.