For the 2018-2019 school year, Tomball High School received a B grade from the
Texas Education Agency, with an overall score of 88 out of 100. This is notably 5 points lower than their fellow Tomball ISD high school,
Tomball Memorial High School, which received a 93 out of 100. Within the three performance domains, Tomball High School received an A grade for Student Achievement (score of 92), a B grade for School Progress (score of 81), and a C grade for Closing the Gaps (score of 79). For context, Tomball Memorial High School received an A grade for Student Achievement (score of 95, 3 points higher), an A grade for Student Progress (score of 92, 11 points higher), and a B grade for Closing the Gaps (score of 89, 10 points higher). Tomball High School received one distinction designation for Academic Achievement (in Social Studies), while failing to receive the Academic Achievement in Science, Mathematics, English Language Arts/Reading, and Postsecondary Readiness, while also failing to place in the top 25% in Comparative Academic Growth and Comparative Closing the Gaps. For context, Tomball Memorial High School received Academic Achievement marks in Social Studies, Mathematics, and English Language Arts/Reading, while successfully placing in the top 25% in Comparative Academic Growth and Comparative Closing the Gaps. For the 2019-2020 school year, U.S. News gave Tomball High School a score of an 81.41 out of 100. The school is ranked 275th among Texas high schools, and 3,307th nationally. According to U.S. News, 43% of the school's students took at least one AP (Advanced Placement) exam in 2020, and 68% of those students passed at least one. Inversely, 32% of Tomball High School students who took at least one AP exam did not pass any of their AP exams. These marks are lower than their district's average, yet higher than their state's average. ==Athletics==