The chart below lists the 14 largest ISD's in Dallas County as of 2019. Using Texas Education Agency meeting standards data from 2012 through 2019 it shows the 7 year gain in the percentage of students meeting standard for each district each year. This data was found on the Commit Database at https://commitpartnership.org/dashboard/dashboard-gallery
Notice that, with a 7 year gain of 24 percentage points, Lancaster ISD has the highest percentage gain of any Dallas County school district! Dallas ISD is second place with 18 percentage points. Coppell and Irving are tied for third and fourth with 17 percentage points gain each. Fifth is Grand Prairie with 14 percentage points gain.