The Trend in International Mathematics and Science Study reveals how the math and science achievement of students in participating countries compares with that of their international peers. Since 1995, the results have been surprising and disappointing for some countries. Astonished and disappointed by such outcomes, scholars and educational leaders are turning to top-achieving countries for approaches to close the achievement gap. To reverse the achievement gap, it is imperative to consider whether approaches used in top-achieving countries deserve primacy over approaches used within-country. Using TIMSS data, findings from this study show that every country in the sample has schools from which reformers could draw approaches to close the achievement gap. Additionally, this study revealed existence of schools serving disadvantaged students achieving at the top and schools serving advantaged students achieving at the bottom. Based on these findings, we highlight the importance of considering approaches used within-country by proposing a framework for education reformers as to where and how to initiate reform to close the achievement gap.