Pre-university policy can determine the success (or failure) of university studies. Using different econometric techniques, this work carries out an exploratory study to assess the relationship between the mathematics skills developed at upper secondary school and performance and retention in university studies in the Economic-Business area. Our findings point out the recommended secondary education track to access the Economics, Business and Marketing Degrees is not the most suitable to achieve success in these studies. A set of specific proposals of Educational Policy is shown.