Two job

So before quitting my job I got hired at GameStop as a seasonal. They worked well with my old job but a week after I quit my job I got a new one and they want me working almost everyday. There is no way I am able to work both job since I also go to uni full time. The new job is more convenient since I get paid $12.50 rather than $11 at GameStop. What should I do. I want to quit at GameStop but at the same time I feel like that will look bad.

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