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How much time did you put into your May’21 exam? That would help give some context and be able to better advise you.
But without knowing that, I would say it’s not impossible – 100+ days at 13 hours a week is around 140 hours, which could bring you from 55% to 75% if you really focus on your problem areas.
Feb’22 only makes sense if you’re going to put in the same effort from now until Feb’22, otherwise, it may work against you if/when you start forgetting what you’ve learnt for May’21.