In which tense is the sentence "I hadn't read anything before the test" written?

The sentence "I hadn't read anything before the test" is written in the Past Perfect tense. This tense is used to describe an action that was completed before another action or point in the past. In this case, the action of not reading anything occurred before the test took place, indicating a sequence of events in the past. The structure of the Past Perfect is formed using "had" followed by the past participle of the verb, which in this case is "read." Thus, the sentence properly conveys that the action relating to reading was completed prior to the test, fitting perfectly into the definition and structure of the Past Perfect tense.