If we allow entry of students from underperforming schools into colleges with historically high academic requirements, one of two things will happen, neither of which are particularly good:

1. These students will struggle and be much more likely to fail out, depending on how much of a boost they're given by the so called adversity score

2. Standards will be lowered and as a result graduates will be less competent and schools lose prestige and/or society suffers in the long run from workers who previously would not have qualified for their degrees.

You cannot undo the damage of 12 years of poor schooling by simply throwing a student into a more rigorous curriculum, no matter how admirable the intent.

And arguably point 2 has already been happening for some time anyway given the swelling of college ranks over the last few years and the corresponding devaluation of the college degree. More people may hold degrees, but the normal distribution of intelligence has not changed, which must indicate that the rigor of the average degree has dropped substantially in the last few decades given the proportion of the population that is now educated.