Any of these is possible: Note:"math" is American English, "maths" is more British English. I had done my/the math exercises before my mom got home. I had done exercises from my math class before my mom got home.
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CliveSay 'in'. But more natural is this.eg I did math exercises before my mom got home.Past Perfect is not wrong, but Simple Past is more common when a word like ''below' makes the sequence of events obvious.CliveI think you meant "before" not "below".
AlpheccaStarsNote:"math" is American English, "maths" is more British English.On the subject, "mom" is also American. The British equivalent is "mum".