Is it GCSE's?
GCSE is more like a Gymnasium exam for 16 year olds.
en.wikipedia.org/wiki/GCSE
In most of the British system the GCSE determine whether you'll go on to do A levels (more like the Matura)
en.wikipedia.org/wiki/Advanced_Level_(UK)
Maybe also look at the International Baccalaureate (need a degree to spell that!!!)
en.wikipedia.org/wiki/IB_Diploma_Programme
en.wikipedia.org/wiki/List_of_secondary_school_leaving_certificates#Europe
No idea how they compare or how to translate the grades. Sorry.