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Read ROS and Soft Dollar Standards and then just drill questions for the rest of it - aside from greater emphasis on those two, the Ethics material doesn’t change. I did exactly this at L2.
What’s the best way to study ethics for Level 2? The same way you studied ethics for L1.
Read the material. Answer the questions. Repeat as necessary.
(BTW–just to save you the trouble–it’s the same process in Level 3.)