Sorry for the late reply - the weekend's the only time I have to catch up on my other modules, and I've been trying to make the most of it.
I think this is a rather good question, Wen Qi. I don't come from a history of ZOMG AWESOME exam results (4As in UPSR, 7 in PMR, 8 in SPM, none for STPM) and to be honest for the last couple of years in high school I've been questioning the validity of grades.
What are grades for? We've had a lot of people tell us, over the years, that grades are everything. Our parents tell us that if we get good grades, they'll buy us fancy new toys. Our society measures our self-worth (as kids) with how well we do in school. Asian societies, in particular, believe that the primary function of a good son/daughter is to go to school, be kuai, and come back with good grades (co-curricular activities be damned).
But really - you know, when we think about it - grades are merely the tools with which future employers use to measure your value (or perceived value, or future value) to the company you're going to work for. Grades are an indicator of performance, though not a very good one at that. And the thing is that employers have no choice but to use grades as indicators because they can't really measure the true value of an employee - that is your actual performance, while you're on the job, a couple of years down the road.
(This is probably why you hear people say that grades matter for only your first job, and then after that other things like leadership and people skills count for more. I've a cousin, by the way, who went to Cambridge for E&E Engineering, and to this day his boss doesn't even know where he gets his degree from).
I must note here that this argument doesn't apply to certain specialized fields, where grades do have a strong correlation to performance - med school for one, and nursing, and perhaps even law.
For the rest of the other vocations however, we pretty much know that whatever we learn in university would probably be useless by the time we go out to the working world. Or that - when we finally get our jobs, 90% of the things we learnt in uni won't be used by us in the day-to-day grinds of our jobs.
I know I'm ranting, but I want to throw this out to you: are grades an accurate indicator of performance? The modern world - which is now primarily capitalist - measures performance by economic productivity, and so is there a strong corellation between economically productive people and grades? If there isn't, what does this mean?
I guess my point is that: don't worry too much about scoring perfect 4.0s la, Wen Qi. It won't be too long before everyone is out in the working world, and in there, at least, people would be measured not by an indicator or performance, but by actual performance itself.
And performance, as a metric, is a lot harder to game.