L.,
Been there, done that, and I know exactly what your are going through. I have a 12 year old stepson and a 5 year old. My 12 year old was a straight A student even received the Govenors Award for his FCAT scores. He also went throught a time of smart mouth statments,back talk, and testing authority figures in his life. Every child is different and every child places value on something, each is quite different. Our 12 year old valued his "stuff" computer, playstation, ds, exct. We sat him down told him this was a family where we all respected each other and made sure he understood the meaning of respect and what the meaning of rude is. Then if he continued with bad behavior he lost items one at a time. Oh how he tested it too, the first couple of days loosing his ds "oh well" he said "I can still have my computer" that was considered a "smart mouth" statement and that too was taken. After about a month of loosing his stuff he realized how much his behavior had cost him. I am glad to report that he is a very respectful young man now and that phase was only temporary. I can't even imagine what phases await for us in his teen years :~).
D. J.
Married-Working Mom of two boys