There is an Import tab in Internal Exams Manager to import results from a template spreadsheet previously exported from the Exam Entries Report option.
Access to the Import tab is currently restricted to staff with Modify rights to the module, which means that to give the rights to import results enables those staff to edit pretty much anything else to do with the school exams.
Please would you consider if the Import option could be made available to those with Write access instead, which would mean a smaller pool of staff requiring Modify rights and reduce the possibility of unintended damage to an exam session?