My sister and my mum cannot get along?

hiya, it could be that your mum and sister are so much a like that they can't get on together.you need to talk to your mum about this as your exams are very important and them arguing will put pressure on you so you can't concentrate on your exams.so talk to your mum now.it might be that your sister as got to find some where else to live for a quieter house.x