Hi there, I study undergrad physics in greece and as most greek students,first 2 years,I would just read my lessons in the examing periods a bit (7/20 lessons passed).Truth is,I've rarely studied in my life up to now,math and physics were always my favorite lessons and I didn't have to make any effort to get 10s.Well,that was really a problem when I got in the university and saw,that things are quite different than up to that point and my introverted character just made things worse(like having to join a team on lab with people you don't know and can't cooperate etc.).Well,that continued for my first two years in my studies (undergrad in greece is 4 years),until lately that is. I realized (kinda late,i know) that I have to stop playing around and focus. Well,sorry for the boring backround there...so I'll get to the point. Since the moment I've "realized", I'm working the hardest I have ever worked.But you know,time is not always your friend.I even made a tight schedule I follow every day to minimize wasted time.At the moment,about 60 hours per week are dedicated on my studies,I rarely go out and it feels very strange to me.At the beggining it was hard to devote myself at such a task,but now I even get guilty thoughts,if I miss 30mins from my schedule,because I overslept.It still feels though as if it's not enough (although it may be). I have to say,it's really strange,I feel I'm happy and sad at the same time. Any others who feel like this?Any suggestions?Plz feel free to to express your opinions/thoughts. Also another question:Since time is not really by my side,I have to make a best possible "good grades vs time to graduate" ratio.Since I'd like to do a master in something quantum related (most probably nanoscience) should I aim to get good grades at lessons related to quantum physics(eg.quantum mech,complex analysis etc.)?