Prayer for a hidden miracle?

Hi. I know that the Rabbi’s opinion is that God does not intervene, but I am less convinced (and you yourself do not categorically deny this, but simply say that it is not evident, so apparently not).
But regardless of this, from a purely halakhic perspective – am I allowed to pray that the Ministry of Education will lose my exam booklet and therefore give me the Magen (submission grade) as a final grade? Is this actually a prayer for a hidden miracle (which is forbidden) or not?
(Perhaps the Rabbi could also answer what he thinks the definition of a hidden miracle is?)