I wouldn’t say ‘most jobs’, but a lot of jobs don’t actually care about diplomas.
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The customer service jobs I’ve had typically only had a short ‘can you do basic math?’ type quiz beforehand just to see if I could operate a cash register.
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My warehouse jobs just had simple safety training and subsequent quizzes.
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Restaurant work only requires a food-handler’s card.
In my experience, entry-level jobs care more about you having a reliable form of transportation + flexible schedule than if you passed high school.