The Secondary School at Sumedha College offers education from Grade 6 to Grade 13. This stage is critical as it prepares students for the General Certificate of Education Ordinary Level (O/L) and Advanced Level (A/L) Examination. The school has achieved a remarkable milestone at both examinations scoring 94% pass ratio at G.C.E. (O/L) and 60% ratio at the G.C.E. (A/L) Examinations.
Sumedha College follows the National Curriculum in Bilingual where Mathematics, Science, Business Studies, Information & Communication Technology, and Health and Physical Education are taught in English.
The school strongly emphasizes developing well-rounded citizens who are not only academically competent but also possess leadership skills and other talents. The school has offered 24 sports activities and strongly believes, indulging in a sports activity will produce a healthy personality. Therefore, after considering the student's participation in sports activities, the school will offer marks at each end of the term.
- G. C. E. (O/L) Examination
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G.C.E. (O/L) Basket subjects |
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| Group I | Group II | Group III |
| Business Studies | Appreciation of English Literary Text | Information and Communication Technology |
| Tamil Language | Oriental Music | Health and Physical Education |
| Japanese Language | Dancing | |
| Art | ||
- G.C.E. (A/L) Examination
| Science stream | |||
| Biology | Chemistry | Physics | Agriculture |
| Combined Maths | Information and Communication Technology | English | |
| Commerce stream (English and Sinhala medium) | |||
| Economics | Business Studies | Accounting | Information and Communication Technology |
| Technology stream | |||
| Information and Communication Technology | Science for Technology | Engineering Technology | Biosystems technology |





