A higher GPA will probably mean more to your future career prospects than keeping the math major.
What leads you to think this?
College can be a place you make friends who last a lifetime, if you put some effort in.
What kind of effort?
What leads you to think this?
One major is enough; many companies look at GPA and a low GPA can rule you out but no second major won't. The GPA/more classes pareto curve is also usually more favorable towards one major. But if it's a very small commitment for OP my advice doesn't stand.
What kind of effort?
Talk to people, be friendly, stay in touch, initiate social activities, be a good friend.
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