The Aviation Knowledge test does have a minimum required score. When Delta sends out the invite email they will provide you a study guide for the test. You need to break down each topic in detail. You may create a document that is 20-30 pages of information. You will learn so much by doing the work yourself. People who rely on information from online resources or other people are destined to fail. If you live by the gouge, you will die by the gouge. Delta makes the test hard for a reason. What is your level of commitment.