What about heterogenous classes with high-track curriculum?

It’s clear from educational research that “tracking” high school students into low to high-level courses based on their prior academic achievement denies opportunities to low income students and many students of color. De-tracking is clearly in order for school districts seeking to offer equal educational opportunity to all students.
However, de-tracking can be done in many ways. The MMSD administration’s plan for tenth grade English courses at West High School follows one model: eliminate high level courses, require all students to take the same course and depend on teachers to “differentiate” instruction so that students of all ability levels and interest are challenged and gain academically.
A diverse suburban district in New York has narrowed the achievement gap in math by offering its high-track curriculum to all students. Rather than offer a mid-range materials with special opportunities for very capable students to accelerate to all students, the district has offered the same high-level courses to all students. Students having difficulty with the course material also attend special support classes and receive afterschool help four days a week. Closing the Achievement Gap by Detracking?
The resulting gains in student achievement are worth our consideration.
from Phi Delta Kappan, April 2005