Bala - I disagree. I completely understand what the pp meant by that comment.
I was the top performer of my year throughout my fairly poor comp. I came top of 300 kids in GCSES with 5 A*'s and 6 A grades. I coasted it...didn't even revise. It was easy. I was probably any teachers dream pupil in an understaffed, underperforming school with lots of 'problem' kids. I was polite, a perfectionist, always handed work in on time - could be completely left alone to crack on, and would come top every time with minimal teacher input.
I was never pushed, never given difficult or stretching tasks. No extra work, no further learning. I never experienced what it was like to struggle, or to fail, or be 'imperfect' in anything academic. The work was easy, I was fucking awesome, the best of the bunch academically, and I knew it.
My comp didn't have a sixth form so I went to college for A Levels. What a massive, massive reality check that was. Suddenly I wasn't the best - I was one of 25 other kids doing a Double Maths A Level, who'd all had A*'s at GCSE. I was distinctly average in that cohort and I hated it. Some of the others were bona-fide geniuses and completely outshone me. At age 16, I had no idea how to handle that because i'd never experienced it, never had to even try hard before.
It completely demotivated me and pushed my ego and confidence through the floor. I became gradually more disengaged and resigned to the fact that I wasn't the best, so why try. I completed college with middling 4 x B grade A Levels. Took a gap year because I couldn't face more disappointment at Uni. Never went back.
I've done OK and it's worked out well for me in the end. But, anecdotally, a lot of the 'clever' kids at school with me are the ones that ended up just getting a job rather than going all the way with education. And lots of those who were average students seem to be the ones who went to Uni and further.
Bright and able kids need to be pushed/stretched/made to think IMO. Not to make them even better, but to prepare them and give them experience in what it's like to struggle with something. How do you learn to strive and try hard if you've never had to do it? And what impact does it have at the point in a childs life where they realise that everything won't always just fall in their lap?