Admission stats for Columbia GS are easily accessible through the CollegeBoard. It’s worth noting that the stats for GS are clearly at the level of other Ivy League/elite colleges in the US (although the acceptance rate is relatively higher due to very small, self-selected applicant pool).
According to the CollegeBoard database, these are the stats for CC/SEAS and GS.
–Columbia GS–
CR: 650-760
M: 670-760
WR: 670-760
GPA: 3.89/4.0
–CC/SEAS–
CR: 690-780
M: 700-790
WR: 700-780
GPA: 3.90/4.0
For comparison:
–Cornell–
CR: 650-740
M: 680-770
WR: NOT REPORTED
GPA: NOT REPORTED
"Admission to Columbia GS is highly selective and “extremely competitive.” Admission standards are among the highest in the nation: the SAT score range (25th -75th percentiles) for admitted students is 650-760 for Critical Reading, 670-760 for Math, and 670-760 for Writing, comparable to that of Brown and Cornell.”