(Most schools use a weighted GPA out of 4.0, though some report an unweighted GPA. This school did not officially report its average GPA, but we've estimated it here using data from over 1,000 schools.). With a GPA of 3.42, Texas Tech requires you to be around average in your high school class.You'll need a mix of A's and B's, and very few C's. If you have a lower GPA, you can compensate with harder courses like AP or IB classes. This will help boost your weighted GPA and show your ability to take college classes.he average SAT score composite at Texas Tech is a 1631. This score makes Texas Tech Competitive for SAT test scores. The 25th percentile SAT score is 1480, and the 75th percentile SAT score is 1770.