noun
final examination; main exam
Refers to the official, final, or main examination, as opposed to a mock or preliminary test. Common in academic and certification contexts.
本試験は来週の金曜日に行われます。
The final examination will be held next Friday.
模擬試験の結果を踏まえて、本試験に備える。
Based on the mock exam results, I prepare for the main exam.
試験 is a general term for any exam or test; 本試験 specifies the main or final one.
Compound of 本 (ほん, 'main', 'real') and 試験 (しけん, 'examination').