| The following subjects are offered to student undertaking the Leaving Certificate Programme within Grennan College. | |||
Leaving Certificate Subjects |
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| Gaeilge | English | Maths | |
| French | History | Geography | |
| Biology | Chemistry | Art,Craft, Design | |
| Home Economics | Construction Studies | Business Studies | |
| Technical Graphics | Engineering | Physical Education | |
| Music | Computer Studies | Career Guidance | |