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The process of getting registered and set up with the Board of Registered Nursing is long and extensive. Your nursing school is probably going to have complete your application to the board and get you LiveScan fingerprinting done well before you graduate because that’s just how long it takes. The processing times are two to three months behind as you’ll see here: http://www.rn.ca.gov/times.shtml
I remember after graduating in mid-June, I had my Authorization To Test(ATT) which allows you to go on PearsonVue.com and schedule online on July, 27 2017. I took my test after completing all of the UWorld questions – approximately 1400 of them then took the test on September 1, 2017 which I failed.