While there are notable exceptions, hard work is not a reliable predictor of success. Do you really think those multi-million dollar penthouses in Manhattan and those huge estates in the hills on the SF Bay peninsula are inhabited by people who simply "muscled through it"? Being (or knowing) the right people is a reliable predictor of success. By and large, those guys are the ones making it big.
My advice to someone going off to college would be: 1. Go to the most prestigious one you can afford/luck into and 2. Make friends with the richest/most well connected kids you meet.