What happens if I get financial aid like pell grants, I had 4 classes, and I drop out of two?

I signed up for 4 classes,
I dropped one class, it was too hard.
And I want to drop another one, because the math is too hard for me.

I heard that I might be put on probation from the financial aid, because I won’t complete the class, does this mean I will never be eligible for financial aid ever again?
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