This list of "Most Challenging High Schools" published by The Washington Post is determined by taking the total number of Advanced Placement, International Baccalaureate and Advanced International Certificate of Education tests given at a school each year and dividing it by the number of seniors who graduated that year. (Note: these are students taking these tests, not necessarily passing the tests.)
National Ranking - School (public ISD, charter or private)
2 - Uplift North Hills Prep (charter)
4 - Talented/Gifted magnet (Dallas)
5 - Science/Engineering magnet (Dallas)
16 - Uplift Summit Prep (charter)
20 - Rangel girls school (Dallas)
29 - Uplift Williams Prep (charter)
35 - Dallas International (private)
36 - Westlake (charter)
59 - Harmony Innovation (charter)
72 - Law Magnet (Dallas)
93 - Highland Park (Highland Park)
156 - Uplift Peak Prep (charter)
202 - Health magnet (Dallas)
347 - J.J. Pearce (Richardson)
366 - Colleyville Heritage (Grapevine-Colleyville)
400 - Academy of Irving (Irving)
411 - Harmony Science Academy (charter)
414 - North (McKinney)
416 - W.T. White (Dallas)
430 - Grapevine (Grapevine-Colleyville)
484 - Liberty (Frisco)
530 - Hillcrest (Dallas)
536 - Southlake Carroll (Carroll)
551 - Plano West (Plano)
561 - McKinney (McKinney)
617 - Boyd (McKinney)
668 - Richardson (Richardson)
740 - Paschal (Ft. Worth)
885 - Wakeland (Frisco)
889 - Centennial (Frisco)
921 - Creekview (Carrollton-Farmers Branch)
993 - Keller (Keller)
1049 - Allen (Allen)
1064 - Lone Star (Frisco)
1088 - Frisco (Frisco)
1092 - Heritage (Frisco)
1123 - L.D. Bell (HEB)
1124 - Flower Mound (Lewisville)
1170 - Berkner (Richardson)
1184 - Woodrow Wilson (Dallas)
1409 - Newman Smith (Carrollton-Farmers Branch)
1489 - Trinity (HEB)
1728 - Denison (Denison)
1796 - North Garland (Garland)
1864 - Sherman (Sherman)
1977 - Sachse (Garland)
Source: The Washington Post