J.S.
I go through the exact same thing with my daughter. It started at age 3 and she is now almost 7. I just set firm boundries and try not to argue with her. If she doesn't clean her room then she gets no tv time or computer time. When she yells at me I tell her I can't hear what she is saying and when she is ready to talk instead of yell I'd be happy to listen. Then I walk away. As far as cleaning up goes, I tell my daughter we need to beat the clock then set the timer for the amount of time I think she can get the work done in. If she beats the clock she gets an extra story. I have to find creative ways to get her to do something because she wants too, not because she has to. I hope this helps some. It is still a battle. My pediatrician says it's just a phase. I don't necessarily agree with her but oh well. If you find something else out let me know.