。
She took an oral English exam.
Literal
She [topic-は] English [genitive-の] oral exam [object-を] received.
口頭試験 ('oral exam') is built from 口 ('mouth') + 頭 ('head') = 'spoken / oral' + 試験 ('exam') — Japanese stacks the qualifier in front, English-style modification but with native compounding morphology. The 口頭 morpheme also appears in 口頭試問 ('oral examination,' the academic defense type) and 口頭で ('orally / verbally'). 試験を受ける uses the verb 受ける ('receive') — exams in Japanese are framed as something one receives from an institution rather than actively undertakes.