A recent study done at Kalamazoo College showed that work have a little or no effect on their college average GPA. Many other variables such as time spent on studying, time spent on clubs or organization, high school GPA and money spent in a quarter, which could potentially affect students GPA were tested. Money spent in last quarter had a negative correlation with the GPA. Student who earned a significant amount of money mostly spend their money on entertainment so they had less amount of time to focus on their study. So it does not matter if you work more but make sure if you have a lot of money and you good grades then saving is the best option.