How might I do this? Having 2 jobs doesn't hurt..
Look up temporary employment offices in your area. Go fill out applications with them ASAP. Shave & put on a pair of khakis & a polo shirt; it helps. Most people go in those places wearing gym shorts & a t shirt. Explain your situation that you're home for the summer & looking for a job. Most jobs they hire for are 30-60-90 day temporary assignments or jobs that are 90 day temp then hired perm with the company. Tell them you'd like a 90 day temporary assignment & you're willing to work any 8hr shift. Most temp jobs will be $8-10/hr. At $10/hr working 40hrs a week you'll bring home close to $4k after taxes in 90 days. Most factories that use temps will let you work overtime if you asked, that'll be time & a half.
If you're willing to work over the summer to make money that's the way to go. Most students are lazy & want to lay around on their ass & party all summer like they're a 17yo child. Keeping the 2nd job you will be able to rake in some dough, but it'll take a lot of dedication.
When I was in school I decided I'd rather work my summers instead of partying it away like my friends. It pays off when you go back loaded with cash & they are broke as a joke digging the change jar for gas/grocery money.