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You are not alone, good sir. There has to be a term for this feeling because it happens so often before a big test.
Just remember that you’ve busted your ass for a significant amount of time preparing for this thing. Do what you gotta do these last couple days but trust in your preparation and your mind’s ability to recall what you’ve learned. I believe that your months of preparation will contribute more to your performance on test day than what you squeeze in during this final week of chaos.
Simply put, trust the stuff!