When my partner in a project has a sudden change of heart and confesses to the the professor that he cheated and we both get a negative mark(-8 marks) even though i didn't know or participate in cheating 😡

I'm pretty sure you can appeal shit like that, providing shit for brains tells the head of the modules and or year that he acted on his own whim

Choose your partners wisely

Punch your partner in the face....with a chair.

Nobody likes rats.

I was a rat once, out of a misplaced sense of 'the greater good'.

Learnt that it doesn't work the way I hoped.

Wiser now.

That sucks, and I agree with @RubyTuesday -- but gotta put on my old man hat and say, "Welcome to life." Other people's poor decisions effect you, sometimes quite personally. 10 years from now, this "extracurricular lesson" might be the only thing you remember from the class.