what level of education is gcse

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CCEA offers 41 GCSE qualifications in a range of subjects. These qualifications, designed to suit students at Key Stage 4, are at Level 1/2 on the Regulated Qualifications Framework.
Each qualification has 120 guided learning hours and contributes to the aim and objectives of the Northern Ireland Curriculum. This includes encouraging students to continue to develop the Cross-Curricular Skills and the Thinking Skills and Personal Capabilities.

References:

http://ccea.org.uk/key-stage-4/gcse
http://www.surveymonkey.com/mp/education-demographics-survey-template/