It is graded on a curve. Raising the student body score on a synthetic measure is pointless. (Edit: You could argue "exam technique" is a good skill though, may

It is graded on a curve. Raising the student body score on a synthetic measure is pointless. (Edit: You could argue "exam technique" is a good skill though, maybe?) But ye, since rich families buy prep courses it becomes an arms race, and poor kids need them too.