Assessment and Qualifications Alliance is a UK-based exam board that provides qualifications for schools and colleges, including GCSEs, A-levels, and vocational qualifications.

Edexcel is a global education company. It's the only privately owned awarding body for academic and vocational qualifications in the UK. 
Edexcel's qualifications, which include GCSEs, A-levels, and BTECs, are recognized both in the UK and internationally.