Your son would meet the requirement of being a student under 24 since he attended school at least part of at least 5 months.
If he lived in your home for the time he was not in school, that would meet the requirement of living in your home all year.
The requirement of support is what's left. It does not matter HOW MUCH he earned, rather what he did with the funds.
If you supplied more than half his support, he would be your dependent.
If he did, he is not your dependent.
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