I'm fed up because I have to share a room with my sister. I'm very tidy and she isn't. She never cleans or putsher clothes away. The problem is that Mum gets annoyed with both of us when the room is a mess. It's not fair. What should I do ?

You should ask your sister to help you tidy the room once a week. If she refuses, you should discuss the problem with your Mum.

Proszę bardzo :)