Any help with this area would be greatly appreciated

The current study policy in place within my company states the following for our students:

The specific proportion of costs to be repaid is on a sliding scale and is shown below:

During a course of study and up to 6 months after the date of successfully passing the last exam – 100% of costs

Between 6 and 9 months after the date of successfully passing the last exam – 50% of costs

Between 9 and 12 months after the date of successfully passing the last exam – 25% of costs

My query is concerning the terms used. “Successfully passing” the last exam. This implies failing the exam will incur the employee no expense, and only passing the exam will require the repayment of the costs incurred, in line with each of the proportions above.

If an employee were to fail an exam, and leave, would they be required to repay the costs incurred for the failed exam??

Thanks for your help