Many graduate schools will allow you to begin taking the nonclinical coarsework prior to admitting you into their graduate nursing program. Others may utilize a provisional admission by reviewing all aspects of the applicants files which may include exceptional references, letters of recognition, above average scores on the GRE, or maybe a great interview with the Dept. chair person.
Some of the most brilliant people I know have come in through the back door
......and then there are those who crawl though the window.