I attended Ethics classes by Atul Garg sir at Oreint IAS in my 4th and last attempt. They were immensly helpful to me. Although there has been strict marking in Ethics paper I still amanged to get a decent score of 99.
Before I attended his classes, I had gone through Ethics class notes from Vajiram, Pawan kumar sir, Ansari sir (Lukmaan) and VisionIAS. But they did not helped. The reason being that Ethics is one subject for which you need to understand and internalise the concept. It is very hard to do so if you just read notes.
I will advise you to attend ethics classes once at least somewhere. Would recommend Atul sir as he keeps on updating his content with demand of the paper. He relates ethical concept with current affairs as well as Indian mythology. You’ll be never short of examples after attending his classes.
The notes are published here