As a final review, would you reread the ethics handbook, or resolve the CFAI & Kaplan Qbanks, given that you already solved them twice before? I feel resolving questions is more practical, and less time consuming so I can focus on other weaknesses areas. However, by not rereading the handbook I feel like taking the risk of ignoring some points that may have not been covered in the CFAI & Kaplan Qbanks. The CFAI & Kaplan Qbanks questions are around 600 in total
CFAI lots of Ethics questions. I would say just practice those questions and re-read sections that you could not answer correctly.