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.
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.”