Retain knowledge

Is there a spell or ritual that could help me retain knowledge?
I have a biology final tomorrow, I have been studying, but the information just doesn't seem to stick.
And help or suggestions?
Thank you
Blessed be

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try to type on the search bar the word exam, because in the last days others asked about the same problem and the answers given seem quite intresting.
For myself I usually have a mint herbal tea, with brown sugar pouring hot water on fresh mint leaves in a cup, and let it brew till it cools down a bit, and drink with the Leaves still inside the cup because mint can be usefull for relaxation and minor stomac aches (like the one you get when your nervous). Please check first if you're allergic.