Admission officials will look at ALL of your ACT sub-scores, not just the Composite, and if one score (in this case, math) is well below the others, it will be duly noted that it is an exception. Also, if your math score is on the low side but you’ve already taken calc as a junior and gotten an “A” in it, this will be more important than your ACT score on that section.
But, even so, your math ACT score could still have some impact on your college verdicts, especially at the hyper-selective colleges like Georgetown, where your “competitor applicants” may have similar transcripts and high test results across the board. However, your other stronger ACT scores and your calc grade will help to push the math result towards the back burner.
Yet remember that the most sought-after schools are looking for applicants who not only have top grades and test scores but who also submit applications that include other distinctions … atypical extracurricular activities, extraordinary achievements, an unusual background, etc.
So if you don’t get the good news you want next year, it may not be at all connected to your math ACT score.
Hope that helps. Have a great summer.