Qual Quad de Sub-15 tinha um Quad de Sub-15 da BBC e um Quad de Sub-15 da GT?
CREATE TABLE table_name_68 (u15_4th_quad VARCHAR, u15_3rd_quad VARCHAR, u15_6th_quad VARCHAR)
SELECT u15_4th_quad FROM table_name_68 WHERE u15_3rd_quad = "bbc" AND u15_6th_quad = "gt"