For any of the prerequisite classes that you have previously taken and passed with a “C” or better will be able to be applied to your degree as long as the credits were earned from an accredited institution.  If you have already enrolled into Excelsior College and have taken some nursing exams, those credits will be good for 10 years.  If you are not an Excelsior student but have taken the first two nursing exams then those credits are good for 5 years before they will expire and you will have to retake the exams.