F**k him

Yeah I am that friend

When I let my friend see my summer assignment and he gets a better score than me despite him not even knowing what the name of the book was

Git gud.

I think its because the friend got a good nights sleep :p

i'm that friend

I might be wrong, maybe the only problem is your study strategy. Let's see:
If you study all night it just means you will get to the test exhausted. Your brain can't think properly in that state, so you fail.
I propose: study at least 2 days before the test, and sleep well in the night before.
You don't need to spend much more time studying than you already are, just change the strategy a bit, and you will see much better results.
Please, at least give this a try.

maybe because that friend paid attention throughout the whole semester