University admissions are generally aware such things exist, though. And if they're actually evaluating on chance of success at university, will take that kind of thing into account. (I.e. a kid from a poor background and a bad school who manages to get good grades will be given priority over a rich kid who went to a good school and got perfect grades. Often the limiting factor for the former in terms of admission to a top university is that they're not ever told that it's a realistic option for them and so they don't even apply).