Can tests predict you ability to succeed in graduate school?

This meta-analysis suggests so. However the correlation with citation seems low. what do you think? "Research has been conducted on the correlation between test scores and various measures of student success: first-year grade point average (GPA), graduate GPA, degree attainment, qualifying or comprehensive examination scores, research productivity, research citation counts, licensing examination performance, and faculty evaluations of students. These results are based on analyses of 3 to 1231 studies across 244 to 259,640 students."