Schools are free to set their own policy regarding cheating and plagiarism etc.
Some schools take the view that any cheating will see the student get zero while others will look at what the student was doing that was cheating e.g. if a student had notes on them relating to one part of the exam then they would get zero for that section but full marks earned for the rest of the paper.
Even the BOS takes a case by case situation and investigates each case on its merits and again may not apply a full zero penalty to an entire exam for a student caught cheating - it depends on the circumstances and what actually happens.
Some schools take the view that any cheating will see the student get zero while others will look at what the student was doing that was cheating e.g. if a student had notes on them relating to one part of the exam then they would get zero for that section but full marks earned for the rest of the paper.
Even the BOS takes a case by case situation and investigates each case on its merits and again may not apply a full zero penalty to an entire exam for a student caught cheating - it depends on the circumstances and what actually happens.