Same thing. Tiger moms build the culture that says not excelling in school is unacceptable; therefore Asians as a group excel in school. Not every Asian has a Tiger mom, of course, but overall that culture supports excelling in school. Among blacks, you are correct that far too many scorn excelling in school as selling out, acting out, etc. In an ideal world we'd change that culture, but changing a culture from outside is extremely difficult. What we CAN do is to provide a chance for black kids who are stuck in poor schools but either have their own version of a Tiger mom or decide for themselves that excelling in school is the key to a good life. Thus accepting the top 10% of every school, even if their standardized scores are not up to speed with the majority. You may not be so extraordinary as to overcome your failing inner city school and achieve parity, but if you excel within that failing inner city school you'll earn a chance to compete at high levels, with the understanding that competing will be much harder than if you had enjoyed a good primary education, educated parents, money for tutors, etc.