Amanda Mattson is the fourth child of Cerys Beynon and sixth child of Olle Mattson. She was born 25 July 1999. She has older half sister Alma Bengtsson from 1989, older half brother Gustav from 1991, older brothers Frederick Watson from 1994 and William from 1997, and older sister Emma Williams from 1995, and younger half-brother Rhys Beynon-Smith from 2008 and Ffion Beynon-Smith from 2010. She lives in Rugby, Warwickshire.
In 2002, when she was 3, she started Nursery at St John's College Cardiff.
In 2010, when she was 8, she started Year 4 at the boarding school S. Anselms in Bakewell, Derbyshire.
In 2012, when she was 13, she started Year 9 at Rugby School in Rugby, Warwickshire.
In 2015, she took her GCSEs with A*A*A*A*A*A*AAAA in English language (A), English literature (A*), Maths (A*), Biology (A), Chemistry (A), Physics (A*), Geography (A*), Italian (A*), Art (A*), Classical Civilisation (A)
In 2015, she started Pre-U at Rugby School in Fine Art, Italian, Maths. She is predicted D1D3D3
In October 2016 she applied to university at Bath (no offer), Sheffield (D3D3D3), Nottingham (D3D3D3), Newcastle (D3D3D3), and Oxford Brookes (D3D3D2). She has put Nottingham as her firm choice and Oxford Brookes as her insurance.