Are these Aboriginal/Mestizos, that you mention, some type of sub-human.
No, they are human beings.
However, at the risk of provoking the wrath of the Admin Moderator, their average IQ is at least 5 points to the left of where it needs to be for them to have any hope of benefitting from formal education.
You need an IQ of about 90 to be able to tackle even the simplest introduction to the three R's [reading, 'riting, and 'rithmetic], and their average IQ is down around 85, and might be substantially lower than that [Lynn & Vanhanen estimate an average IQ of 87 for Mexico, and 79 for Guatemala].
Again, to compare Aboriginal/Mestizo "Hispanic" academic performance with the academic performance of the descendants of the "Castilian" Caucasian "Hispanics" who fled Castro's overthrow of Batista is simply ludicrous.
And, quite frankly, it's absurd to use the same word ["Hispanic"] to describe two wildly disparate groups of people like that.