It is not How Good You Are, It's How Good You Want to Be - says the creative advertiser Paul Arden.
And he has some words of encouragement, in his book of the same name, for those who are struggling with revision for exams. I quote:
HAVE YOU NOTICED THAT THE CLEVEREST PEOPLE AT SCHOOL ARE NOT THOSE WHO MAKE IT IN LIFE?
What you learn at school are facts, known facts.
Your job at school is to accumulate and remember facts. The more you can remember, the better you do.
Those who fail at school are not interested in facts; or maybe the facts are not put in a way they find interesting.
Some people simply don't have a great faculty for memory.
it doesn't mean they are stupid. It means their imagination hasn't been fired up by academic tuition.
People who are conventionally clever get jobs on their qualifications (the past), not on their desire to succeed (the future).
Very simply, they get overtaken by those who continuously strive to be better then they are.
As long as the goal is there, there is no limit to anyone's achievement.
(Phaidon Press 2003:20-21)
And to give an example about goal setting and the power to achieve, as a teenager Victoria Beckham did not just want t be better then her mates, or even to become a famous singer - she wanted to become a world brand:
"I want to be as famous as Persil Automatic"
She wanted it so badly that she set about getting it. It was not how good she was that mattered, it's how good she wanted to be that has got her where she is today.
So don't sweat too much, and Never Panic. You have a long and rich life ahead of you...