There are about 10 vignettes of Ethics in CFAI Curriculum. There are more at portal. Practice all of them a couple of times. As someone said, pay attention on AMC. Same story as last year with ROS. A few page chapter with great weight in vignette questions.
Just keep hammering problems until you remember all the nuances. Idea on the ethics is to do as many problems to see the exact same set up with just different names and background stories. Not much you can do other than that, just too many one off little things. Baciscally have to robot yourself to the point where your brain just knows ok ive seen this exact item set before.