Dartmouth College is a member of the Ivy League as well as one of the country's most selective colleges. In the graph above, the blue and green represent accepted students. You can see that the great majority of students who got into Dartmouth College are concentrated in the upper right corner of the graph. This means they tend to have "A" averages, an ACT composite score above 30, and a combined SAT score (CR+M+W) of above 2100. Hidden beneath the blue and green on the graph is a lot of red, for even students with 4.0 GPAs and high test scores get rejected from Dartmouth. It's one of the reasons I recommend that all students consider Dartmouth a reach school, even if your scores are on target for admission.
At the same time, if your heart is set on Dartmouth and your grades or test scores are a little below the norm, don't give up all hope. As the graph shows, a few students were accepted with test scores and grades that are a little less than ideal. Dartmouth College, like all members of the Ivy League, has holistic admissions, so the admissions officers are evaluating students based on more than numerical data. Students who show some kind of remarkable talent or have a compelling story to tell will often get a close look even if grades and test scores are a little less than perfect.
To learn more about Dartmouth College, high school GPAs, SAT scores and ACT scores, these articles can help: