OET Writing Tips: Learning About Conjunctive Adverbs Developing your letter-writing skills is one of the most critical factors in acing the Occupational English Test. As a test taker enrolled in a review center for OET, it is crucial to seek various writing tips and techniques that can help enhance not only your letter-writing skills but also your learning abilities. For instance, learning about conjunctive adverbs is a practical writing tip that you can apply in your OET exam preparation.