"Good luck for your entrance exam, you've done a lot of preparation so you'll be fine."
- "Good luck for your entrance exam, you've done a lot of preparation so you'll be fine."
"good luck" 「頑張ってね」
"entrance exam" 「編入試験」
"you've done ~" = "you have done" 「〜してきた」
"a lot of preparation" 「たくさん対策」
"~ so you'll be fine" 「〜から大丈夫よ」