Christopher Ray, of the Headmasters' and Headmistresses' Conference, which represents independent school leaders, told BBC News the new system could potentially harm "students who only when they get their AS-level results in Year 12 realise how bright they are, who are perhaps in an underperforming school or college and who suddenly have the self-confidence to aim for the stars".
BBC: A-level plans may 'threaten uptake of tough subjects'