When school got out I opened up my schedule to any day, any time, and I thought I would get more hours. But we're pretty much overstaffed, and since I'm the newest one I usually get the least hours. I'm convinced there's no more hours available. This week I only got 12 hours.

So, I want to look for another part time job, because it seems useless to just have 12 hours a week sometimes. But since my schedule is sporadic, its harder for me to look for another job. How could I ask for a set schedule?

Sounds like right now they're just using you and don't give a fuck how many hours you get, so the only way for it to change is for you to step forward and confront them about it. Then they'll be like "Whoa, an employee who knows how to stand up for themselves and ask for what they need!"

You gotta do it.

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"In a world we need to share;
it's not enough to stand and stare." --Pink Floyd