Under the letter grade scheme, foundation tier papers assess content at grades C to G, while higher tier papers assess content at grades A* to C. In foundation tier papers, the student can obtain a maximum grade of a C, while in a higher tier paper, they can achieve a minimum grade of a D. If a higher tier candidate misses the D grade by a small margin, they are awarded an E. Otherwise, the grade below E in these papers is U. In untiered papers, students can achieve any grade in the scheme.