How would you ask your sisters friends name is in french

Bonjour

asking your sister's friends name

Comment vous appelez-vous ?  (if you're asking your sister and if they're more than one)

Comment t'appelles-tu ? (same as above if ther's only one friend)

Comment s'appellent les amis de ta sœur ?    >  (what are the name of your sister's friend ?)

I wasn't sure of what you were asking for, it should be the last one

do tons of practice sums,.

write down formulas

write formulas in places u see everyday like ur mirror

stay calm before the exam