reclassify

verb

1. (transitive)To classify again; to give a new classification to.

   “Two-car CrossCountry Class 170/5 diesel multiple units are being extended to three-car formations and reclassified as Class 170/6s, to boost capacity on the Birmingham-Stansted Airport route. So far, two have been reformed by Arriva TrainCare at Bristol Barton Hill and put back into traffic.”

2. (transitive)To change the graduation year of (a student) by reclassification.