This is the 1822nd most frequent Polish word.
żeby
"Żeby" means "so that" or "in order to."
Here, the word "żeby" is used as a conjunction introducing a purpose clause, meaning "so that" or "in order that" in English.
Musimy wyjść wcześniej, żeby zdążyć na pociąg.
We need to leave earlier so that we catch the train.
In this sentence, "żeby" serves to introduce the motive or reason for the action, explaining its purpose.
Otworzyłem okno, żeby wypuścić muchę.
I opened the window to let the fly out.
The word "żeby" is utilized to state the goal of studying, which is passing the exam.