If you give us some snack, we'll help you with your exam studies.
If you give us some treats, we could help you study for your tests.
ご質問ありがとうございます。
① "If you give us some snack,"＝「お菓子を僕たち（私達）にくれたら」
"we'll help you with your exam studies."＝「君の試験勉強を手伝うよ。」
② "If you give us some treats,"＝「お菓子を僕たちにくれたら」
"we could help you study for your tests."＝「君の試験勉強を助けてあげることもできるよ。」
ご参考に。
アメリカ合衆国 
