How to get a 'badboy's' attention?

My little sister's asked me how to get a bad boy's attention. Okay so she's in year 10 and so's he. But apparently he really popular and loud but she's quiet in class and people know her but not personally. They have the same sense of humour and she thinks he's really cute. Any thoughts on what she should do?
How to get a 'badboy's' attention?
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