@taekookieeeeesss Hey! I will also audition :). If you are a foreigner,YG will be a little hard. But still best of luck!
Dress up lightly,not like a joker.
Thet means no over-colorful dress,no excessive design or fashion.
No make-up, apply some little foundation and lip-bam.
About skincare, wash your face daily with soap (which suits you), apply some lotion.
Don't worry. I guess your parent's will allow. But if they don't allow, don't force them. Remember always choose a second career/option.
Weight loss tips, practice dance everyday. Practice the hard ones, cuz they burm the most fats. Do some exercises and yoga.
About learning korean,many applications are there like duolingo...etc. If your parent's allow then buy some korean books. Study korean everyday for one hour.
Take care,
Also from which country are you?
Stay safe and healthy