1959: HAMILTON HIGH EIGHTH GRADE ???

This one has me completely baffled. Was it an error on the part of the Trenton Times? Was this really the class of 1959 at Hamilton High? Did the high school host a graduating class whose school was not available? 'tis a mystery. Perphaps a 1959 visitor can explain this article.
Thanks to Alan Wildblood for solving this rather confusing article. Alan Writes:

These are 8th graders. When half of Hamilton upperclassmen of that year (went) to Steinert, there would have been room at the old school for some 8th grades. You see Carol Wirth, daughter of Pauline and a friend of mine. She graduated from 12th grade at Hamilton High in 1963 so it works out.