As a top 5% student, the OP’s child would be an auto admit to UT Austin, although there is not an auto admit to individual colleges/schools like McCombs B School. Looking at various web pages on admissions standards, OP’s son has a decent not a long shot chance to get in to McCombs. The published acceptance rate is 19%. The 75th percentile for all UT matriculated freshmen for 2021 is 1480. Even assuming McCombs is more selective, dollars to donuts 1550 will be greater than the median and probably closer to the 75th percentile. The 75th percentile SAT composite for Princeton is 1570 and the 50th is 1540 as points of reference.