Whenever a parent (usually your mum) asks you to do anything, always respond in the positive  "sure, but can I clean my room first?". No parent is going to sop you from cleaning your room to do something else are they?

Unless of course the something is to clean your room, then you need to respond "OK, but I need to finish this assignment first".

Of course when said parent later finds you lying on your bed listening to music, and they want to know why you aren't cleaning, tell them you were, but bending down had made you feel dizzy, so you thought it wise to lie down before you suffered a major headache.