Are there any moms here with older kids, too?

I have a 10 yr old, 16 yr old, and 6 wk old. My 10 yr old is giving me a RUN for my money...and with my 6 wk old, I'm just exhausted. Hoping to get some ideas on how to keep my little human's behavior in check.

Some examples:

-He called his teacher a b****

-He failed a spelling test recently because he "didn't want to study"

-He no longer cares to do chores

-He lies, even when there's solid evidence of the truth, and gets mad at us for implementing punishment

-He does the exact thing you tell him not to do (ex. don't use the baby bottle brush for the dishes...he used it to clean a greasy pot 😑)

Idk if he's doing this for attention or what's happening, but he's my problem child now. I'm constantly fussing...don't do that, why did you do that, why did you take that, don't say that. I'm so tired and just don't have the energy anymore 🥺