The new tests tell us how well students are learning under the new standards. With the new standards, students are being asked to learn more, and at earlier ages. Typically, when new tests are introduced and standards for learning are raised, a change in scores is expected.
It is important to note that a change in scores does not necessarily reflect a change in students' academic progress. Students continued to grow academically in 2012-13. These new scores simply mean that we are expecting students to reach higher levels of learning than ever before.