...reading and math test scores are very similar for children where English is not the primary language in the home and for children who are in homes where English is the primary language. This holds true for whites, Hispanics, blacks and Asians...more than half of children in each group are not reading proficiently in fourth grade. These low reading scores are especially important because third grade is a pivot point...Up to third grade, students and teachers spend most of their time in developing reading skills, but after third grade, they move away from learning to read. Instead, students use their reading skills to learn science, math and other subjects...and if they're not reading well by fourth grade because of this shift, they're much more likely to not graduate from high school. They're really at a strong disadvantage for the rest of their school years.
Donald Hernandez, co-author of the report, "Diverse Children: Race, Ethnicity, and Immigration in America's New Non-Majority Generation"