I find the details a bit confusing because you seem to intermix the usage of scores and grades. If a score is 95 out of 100, then 95 could be the test score or test grade. Maybe you're referring storing an average grade? In that case I think the general rule would apply - that would be a calculation that can be performed by a form since the stored value would be incorrect if a test score were to change. Test retakes are sometimes granted or resulting scores are sometimes altered on appeal.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.