Dr. Courtney said:
Actually, that's how I did it. From age 12 to 18 I worked numerous food service jobs in New Orleans. As one person put it (not exactly): working poopy jobs for poopy wages surrounded by poopy people. All my uncles and cousins worked similar jobs well into their 30s and 40s. I didn't know what I really wanted in life, but I knew I wanted to break the cycle of menial jobs in New Orleans. Everyone kinda told me that succeeding in college was my path out, and I believed them. My ACT score earned a scholarship to LSU. My only goal the first semester was earning a 3.0 GPA to keep that scholarship. But I so, so wanted to make sure, sure, sure I kept it that I worked as hard as I could, as hard as I knew how. That was 60 hour weeks, because I saw the alternative as losing the scholarship and having a life as a loser in food service.
Going into finals that first semester, I was in the high B range in Calculus and Physics - 10 of my total 15 hour course load, so looking at a solid 3.33 GPA. Then a miracle happened. All that hard work paid off on those finals and I earned a 4.0 GPA (straight As). Over winter break it dawned on me that if such a work effort could pull it off once, I could do it again. So I did. And Again. And Again. Next thing I knew I was getting accepted to Princeton, Stanford, and MIT for graduate school.
But you have to want it.