In http://www.cvastro.org/ECP1.pdf page 8,
Fortunately his friend, Marcel Grossman attended class regularly and
took notes which he carefully rewrote. Grossman allowed Einstein to
use his notes to prepare for the final exams which he subsequently
passed. This is the first instance of Grossman coming to Einstein’s
Albert Einstein got lecture notes of Geometry (not sure if this is exactly geometry) classes from his personal friend rather than taking the class himself. Since he did not attend the class himself and take the notes himself, I feel that he was in an advantage compared to students attending the class and taking the notes themselves.
Not being an ethical hypocrite but I just feel this is unfair (A question comes from sympathy to his classmates in fact.). Personally, sometimes I feel too tired, or the professors bad at teaching but their notes are important (Sometimes one trick the professors ensure high attendance is to suddenly talk about exam questions in class.), or have time clash in the class, I wish I can get notes from someone rather than attending the class or just attending, concentrating on listening but not taking notes. But I feel that this is unethical as many students have the same problems. So if I do so, I have a “time advantage” compared to them.