I agree with a lot of what you're saying. I'd like to point out, though, that some amount of poor schooling is beyond the schools themselves. For example, being raised in a poor family where both parents (or the only parent) are working long hours tends to mean
- The parents aren't there to help with schoolwork
- Nutrition is poorer (which leads to poorer learning)
- The parent's aren't as available for guidance
- etc
Now, to be very clear, none of this is "you're part of a minority, so it effects you". Rather, it's an impact of being poor; and minorities are more likely to be poor, so as more likely to be impacted. So the end result is the same, but it's not an automatic impact of being a minority, nor is it something that limited to minorities (just more likely for them).
- The parents aren't there to help with schoolwork
- Nutrition is poorer (which leads to poorer learning)
- The parent's aren't as available for guidance
- etc
Now, to be very clear, none of this is "you're part of a minority, so it effects you". Rather, it's an impact of being poor; and minorities are more likely to be poor, so as more likely to be impacted. So the end result is the same, but it's not an automatic impact of being a minority, nor is it something that limited to minorities (just more likely for them).