First, to your claim that a quarter of our kids don’t graduate from high school:
“In 2008, 22 percent of Hispanic 18- to 24-year-olds were not enrolled in high school and lacked a high school diploma or equivalent. The corresponding percentages for non-Hispanic whites were 6 percent, blacks were 13 percent and Asians were 4 percent.”
http://www.census.gov/newsroom/releases/archives/education/cb11-106.html
And:
“The percentage of high school dropouts among 16- through 24-year-olds declined from 11.8 percent in 1998 to 7.4 percent in 2010 (source).”
http://nces.ed.gov/fastfacts/display.asp?id=372
The racial demographics for our full school population:
White and Asian: 62%
Black and Hispanic: 38%
http://www.census.gov/prod/2011pubs/p20-564.pdf
You can argue with IQ scores if you want, but Blacks and Hispanics score significantly lower on them than Whites and Asians, and almost 2 out of 5 of our school kids is Black or Hispanic.
“Or equivalent” is the key. Students with GEDs do NOT get into selective colleges without a lot of special circumstances.
And whatever the demographics are, the average IQ is what the average IQ is.