I failed a shit test and dont want to not fail next time.

So I was in class and this HB6 unplugged my laptop charger to tease me. I told her to "pick it up and put it back" in a light hearted tone , nothing threatening just teasing her back.

She said no so, I plugged it back in and said "Don't do it again." Fully expecting her to do it again I reached for her arm and grabbed it just before she unplugged it a second time. we then locked eyes and she said "Are you not gonna pick it up" I replied with "nope" and got back to what I was doing. Then she said " your so stubborn" I then replied with "yeah." Leaving my charger on the floor.

Similar situations like this have happend before where the girl doesn't do what I say. I hold external frame and move on as if nothing just happened but I still feel defeated. What should I have done.

P.S I'm not interested in fucking this girl