actually I agree with lord tony. children need to be disciplined with physical punishment. and I don't mean like slapping or punching but just a firm spankin in the rear end. that's how my parents disciplined me and it's not "traumatizing" it's a good lesson to learn.
i never got results from my mother when i was older, but I've been disciplined when I was a very little kiddo, but that was only once and we both don't remember the reason anymore.
however, i feel like they should be rewarded for doing good. if my kiddo was to study hard for their exams, which is stressful times, and scores well, ill be sure to make up for those stressful weeks with gifts or time out the house or w/e.
heck even if they got bad grades at least they studied, i wouldn't reward them as greatly but I sure as hell wouldn't be mean in any way.
edit:
id just like to mention that my view can be different as i was raised only by my mother for my entire life and she's also a best friend to me alongside of being my mother.