Dear Mia,
I know you're really busy right now because you'll go to Van Mieu tomorrow! I already go there, so I think you should take some advices for the trip tomorrow!
This is winter, so I think you should bring some warm clothes with you. You can take a pair of gloves, a hat or a sweater. You need to take some water, you can be really tired on the way. A mobile phone is a great idea, your mother can call and check on you, you can tell her about the trip and tell her you're okay. Some medicines aren't bad, you may get a headache or stomachache. Last, you should bring a camera, take some pictures for your memories.
Finally, I hope you'll get an enjoyable trip.
Have a great day,
.............. (Tên bạn nhé!)
