This is the 3722nd most frequent Turkish word.
yazmıştı
"Yazmıştı" means "he/she/it had written."
This usage demonstrates the past perfect tense with the third-person singular form of 'yazmıştı', indicating an action completed before another past point.
Ali geçen hafta bir mektup yazmıştı.
Ali had written a letter last week.
Here, 'yazmıştı' refers to an action completed in the past, emphasizing its significance in relation to the author's achievement.
Yazar, uzun süredir beklenen kitabını nihayet yazmıştı.
The author had finally written their long-awaited book.
In this sentence, 'yazmıştı' connects a completed action in the past (writing notes) as a reason for a subsequent result (success in the exam).