Might do to double-check your line breaks, some of that looks a little wonky. As to the ranking system, the letters also have to do with tactical skill and spell selection, versus pure magical power - Imma would probably still be rather above-par for raw power compared to what he'd score in a letter-rank exam, even if the training between his first and second encounters with Lada went a good way to closing that gap.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows