Here is a link to the NCAA sliding scale. The core GPA is what they look at from core classes. The test scores are affected based on the GPA. The ACT consists of four tests: English, Mathematics, Reading, and Science. The score range for each of the four tests is 1 – 36. The composite score, as reported by ACT, is the average of the four test scores earned during a single test administration, rounded to the nearest whole number. So a ACT of a 18 is basically a 72 for overall score. So a student only needs a composite score of 10 to qualify for NCAA Div I. The composite score is what is on sites like Rivals. Eddie Lacy had a 13 composite score so he had a 52 total sum score for the ACT. The other thing is unversities can do a combined score. Lets say a student gets a 10 on two parts of the test the first time but maybe only a six on the other two parts. Well the student can now take the test again and only study for the two parts they did bad on. The 2nd time they got a 10 on both the bad parts but only got a 7 on the two they had 10s on before. The NCAA Clearing House will allow the student to combine the four best scores from every test they take so hence now the student has a composite score of 10 and an overall score of 40 and they qualify with that part.
https://web1.ncaa.org/eligibilitycenter/hs/d1_standards.pdf
Now with that said Ambles has a overall ACT score of 72 so according to the sliding scale his GPA in core classes only needs to be a 2.375