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内容は、このままでOKです。但し、若干のミスは訂正が必要です。

Your younger sister should study in the morning. 〇 
If she sleep well every night, she will study hard more. → If she sleeps well every night, she will be able to study harder.
※sleep → sleeps hard more → harder
I think you should told her that. → I think you should tell her that.
※told → tell

以上です。

kina

ありがとうございます!!!
( ˶ ̇ᵕ​ ̇˶)

taka

You're welcome!

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