This is from the Texas Education Agency's website from their reporting for school year 2010-2011. These are SAT averages based on scores from the senior class of 2010 and only includes the reading and math portions (not writing).
This has been update here for 2013-2014:
http://dallas-area-schools.blogspot.com/2014/12/2013-2014-sat-scores-for-dallas-fort.html
This has been updated here for 2012-2013:
http://dallas-area-schools.blogspot.com/2013/12/2012-dfw-high-schools-ranked-by-sat.html
SAT score - high school (district ISD/charter)
1278 - Talented/Gifted magnet (Dallas)
1236 - Science/Engineering magnet (Dallas)
1196 - Highland Park (Highland Park)
1179 - West (Plano)
1179 - Westlake (charter)
1161 - Carroll (Southlake Carroll)
1159 - Senior (Plano)
1155 - Coppell (Coppell)
1153 - North Hills (charter)
1125 - Flower Mound (Lewisville)
1121 - Flower Mound Marcus (Lewisville)
1120 - East (Plano)
1118 - JJ Pearce (Richardson)
1110 - Fort Worth Academy of Fine Arts (charter)
1104 - Grapevine (Grapevine-Colleyville)
1104 - Richland Collegiate (charter)
1102 - The Colony (Lewisville)
1093 - Argyle (Argyle)
1092 - Sherman (Sherman)
1090 - Hebron (Lewisville)
1089 - Boyd (McKinney)
1088 - Celina (Celina)
1086 - Martin (Arlington)
1086 - Lovejoy (Lovejoy)
1086 - Rockwall (Rockwall)
1080 - Allen (Allen)
1078 - Garland (Garland)
1078 - Heritage (Grapevine-Colleyville)
1077 - Prosper (Prosper)
1074 - Waxahachie Faith Family (charter)
1073 - McKinney (McKinney)
1071 - Centennial (Frisco)
1070 - Lamar (Arlington)
1067 - Granbury (Granbury)
1062 - Liberty (Frisco)
1057 - Heath (Rockwall)
1044 - Howe (Howe)
1043 - Lewisville (Lewisville)
1042 - Frisco (Frisco)
1042 - North (McKinney)
1041 - Midlothian (Midlothian)
1040 - Van Alstyne (Van Alstyne)
1040 - Richardson (Richardson)
1040 - Central (Keller)
1038 - Wakeland (Frisco)
1036 - Guyer (Denton)
1036 - Creekview (Carrollton-Farmers Branch)
1035 - Arlington (Arlington)
1033 - Newman Smith (Carrollton-Farmers Branch)
1033 - LD Bell (HEB)
1032 - Melissa (Melissa)
1031 - Arts Magnet (Dallas)
1026 - Gunter (Gunter)
1025 - Denton (Denton)
1022 - Lake Highlands (Richardson)
1019 - Trinity (HEB)
1018 - Ryan (Denton)
1017 - Rowlett (Garland)
1016 - Lake Dallas (Lake Dallas)
1015 - Denison (Denison)
1011 - Mansfield (Mansfield)
1009 - Ennis (Ennis)
1008 - Poteet (Mesquite)
1007 - Sanger (Sanger)
1006 - Forney (Forney)
1005 - Fossil Ridge (Keller)
1003 - Greenville (Greenville)
1002 - Law magnet (Dallas)
1001 - Berkner (Richardson)
1001 - Health magnet (Dallas)
998 - Summit (Mansfield)
996 - Sachse (Garland)
996 - RL Turner (Carrollton-Farmers Branch)
993 - Anna (Anna)
993 - Legacy (Mansfield)
991 - Royse City (Royse City)
991 - Crandall (Crandall)
991 - Red Oak (Red Oak)
985 - North Garland (Garland)
983 - Naaman Forest (Garland)
979 - Business magnet (Dallas)
977 - Corsicana (Corsicana)
965 - Horn (Mesquite)
965 - Seguin (Arlington)
964 - Rangel (Dallas)
964 - Princeton (Princeton)
963 - Waxahachie (Waxahachie)
961 - Nimitz (Irving)
959 - Treetops (charter)
959 - MacArthur (Irving)
949 - North Mesquite (Mesquite)
948 - South Grand Prairie (Grand Prairie)
947 - Timberview (Mansfield)
946 - Bowie (Arlington)
946 - Pottsboro (Pottsboro)
945 - Little Elm (Little Elm)
945 - Duncanville (Duncanville)
941 - Woodrow Wilson (Dallas)
938 - Grand Prairie (Grand Prairie)
937 - Mesquite (Mesquite)
935 - Singley (Irving)
932 - Ranchview (Carrollton-Farmers Branch)
932 - Hillcrest (Dallas)
930 - South Garland (Garland)
924 - Ford (Quinlan)
922 - Lakeview Centennial (Garland)
916 - Middle College (Dallas)
916 - Winfree (charter)
915 - Evolution Academy (charter)
914 - Sorrells Education magnet (Dallas)
910 - Terrell (Terrell)
903 - Advantage Academy (charter)
898 - Ferris (Ferris)
894 - Irving (Irving)
892 - Sam Houston (Arlington)
886 - West Mesquite (Mesquite)
883 - Skyline (Dallas)
877 - Life School (charter)
876 - WT White (Dallas)
859 - Peak Prep (charter)
855 - Cedar Hill (Cedar Hill)
852 - A+ Academy (charter)
849 - DeSoto (DeSoto)
839 - Pegasus (charter)
836 - Bryan Adams (Dallas)
832 - Sunset (Dallas)
828 - Thomas Jefferson (Dallas)
826 - Seagoville (Dallas)
822 - Universal Academy (charter)
820 - Conrad (Dallas)
802 - Molina (Dallas)
799 - Lancaster (Lancaster)
793 - North Dallas (Dallas)
788 - Kimball (Dallas)
784 - Dallas CAN Academy (charter)
776 - Carter (Dallas)
773 - Pinkston (Dallas)
764 - Adamson (Dallas)
759 - Roosevelt (Dallas)
754 - Maceo Smith (Dallas)
754 - Samuell (Dallas)
751 - Lincoln (Dallas)
748 - Gateway (charter)
734 - Madison (Dallas)
721 - South Oak Cliff (Dallas)
713 - Dallas Faith Family (charter)
