How do I earn $6000-7000 over summer???

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Hi there, I'm about to finish school and i'm heading off to university in September. I'm planning on getting a full time job over summer, earning $4000-5000, but I desperately need to find that other $2000. Does anyone have any ideas on how I can reach my goal before going to university??? Open to online and offline ventures, not needing very much investment Thanks