'Harder than,' 'more than,' 'better than'

Hello

I'd like to ask about how to use "more".
Would you take a look at the following sentences?

1) If I had studied harder, I could have passed the exam.
2) If I had studied more, I could have passed the exam.

Can I use "more" instead of " harder"? If so, do they express the same meaning?

Thank you.
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