NPE

Not Passed Exam
Not Proficient Enough (the student's performance does not meet the minimum proficiency standards required for a passing grade but is not as low as what might be traditionally considered "failing" or "poor.")
Not Previously Evaluated (might be used if the student was not present for the assessment or if the work was not submitted for some reason. It indicates a lack of data rather than an evaluation of performance)
Non-Participation Evaluation (perhaps used in situations where a student did not actively participate in the work or assessments required to earn a traditional grade. This could be applied in courses or projects where participation is a key component of the evaluation process)
Needs Practical Experience (in some educational systems, practical skills and experiences are as important as theoretical knowledge. This designation could suggest that while theoretical understanding is adequate, more practical application or experience is needed.)