Dear Ms. Ryan,
Thank you for posting your request on History Hub!
If the records you are searching for still exist, they are most likely held at the local or county level. We suggest that you contact the Norristown Area School District or city officials for Norristown, PA to see if they can offer you information about how long such records are retained and where they might be located. We also suggest that you contact the Historical Society of Montgomery County, PA to see if they can offer any additional insight.
Finally, the Pennsylvania Department of Education (PDE) may have guidelines that govern the retention or disposal of school records. We suggest that you contact them for further assistance.
We hope this is helpful. Best of luck with your research!
Thank you for the information you have provided. Mary