More A-levels pupils were handed the very highest grade this summer, but the overall pass rate fell for the first time in more than 30 years, official figures show.
In total, just over one in four of exams were awarded an A* or A grade, down 0.3 percentage points on last summer.
It would be "wrong" for Labour to undo the coalition's A-level reforms, the Education Secretary told Good Morning Britain.
Nicky Morgan MP, speaking on A-level results day, said: "schools and colleges are already preparing for these changes and so we should let them get on with that.
"It's wrong to put those changes at further risk and to create further uncertainty."
Didn't get the grades you were expecting? You can still apply for university courses through a process called 'clearing'.
Jane Parry is lead tax partner at PM+M. Here she explains how parents can keep the cost of university funding down.