existential crisis with bio exams

had some mock results back from Feb and got BCE - but got an E in bio, hugely disappointed with the results given I’m predicted AAA but have been working hard on all three since after the mocks anyway. am really disappointed about bio, was one mark off a D but won’t call that a D as it wouldn’t be fair and it’s not exactly as if a D is something to celebrate anyway. Scored 46% between the two papers and so it may not be like that in the real thing but I’ve been getting As and Bs throughout the year in topic tests - is it too late to ascend from an E to A in ~90 days?