What's GCSE?

The General Certificate of Secondary Education (GCSE) is the name of a set of British qualifications, taken by secondary school students, at age of 14-16 in England, Wales, Northern Ireland (in Scotland, the equivalent is the Standard Grade). The education systems of other British territories, such as Gibraltar, also use the qualifications as supplied by the same examination boards. They are also similarly used by international schools around the world offering the qualifications and curriculum to their students.

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In other words, it is similar to the level of HKCEE. I have completed HKCEE in HK and then studied A-level in UK. I found that HKCEEs are far more advance than GCSEs.