 She left school at 14, before taking her final secondary school examinations (which she had been predicted to gain high grades in), partly due to personal difficulties she experienced going back to her regular school whilst starring in a popular television series and also because of the successful commencement of her acting career.At the age of 14, in 2011, Williams started her professional acting career by co-starring in one of the largest ensemble casts on television.She was cast in the role of Arya Stark, the feisty young tomboy daughter of an important noble family in HBO's historical fantasy drama series "Game of Thrones" (based on George R. R. Martin's "A Song of Ice and Fire" epic fantasy novel series).