TerraNova 2 (CAT 6) Standardized Test - Seton Testing Services The TerraNova, Second Edition, known as the CAT 6 is the 6th edition of the California Achievement Test. It tests grades 1-12 students in the areas of Reading (Grades 1-12), Language (Grades 1-12), Math (Grades 1-12), Social Studies (Grades 1-12) and Science (Grades 1-12). It is available in Complete Battery or Survey form.