To OP
We have to have more context as to where you will go to school and what types of jobs there are.
I went to University of London so I was lucky to find a job at KFC nearby on the graveyard shift for pin money. If you are going to uni in a remote location, it may not be nearly as easy.
I live in the states now and from my experience, American employers don't value education as much and almost all of the time they will schedule you right at the time when you have a class and won't give a damn. At least you don't have a whole mindset of a nation so anti-education so you could find a day job who will accommodate your school schedule. If for some reason things have changed drastically towards the worse to how many employers value education, you can find a PT day job, but you will always be safe with a graveyard shift job or late evening job such as bussing tables.
Where there is a will, there is a way. At least you are not trying to save up for a car so it shouldn't take that long to have the money for a Mac. Good luck.