It has been customary for Nepali students to study grades 11 and 12 under the national board and GBS is no exception. After students pass the grade 12 board examination, they are awarded a school leaving certificate and aim for tertiary education. The following subjects come under classes 11 and 12:
Class 11: English, Physics, Biology, Chemistry, Math
Class 12: English, Nepali, Physics, Biology, Chemistry