Up to date chief limited study guides

I was approved for chief limited exam # Q601,Q602,Q603,Q604. Has anyone taken these tests recently? If so what study guides did you use and were they up to date with the new testing material?

From what I understand it’s all basically the same material as the DDE’s. I have the Mariner Advancement DDE flash drive and that has been what I have been studying.

I used that study guide to take the dde unlimited back in 2017 and the electrical and diesel test were new tests and some of the questions were the same but they had been slightly changed, but a lot of them were different. I can’t imagine how hard they are now. That’s why I am trying to find someone who has tested recently who can point me to some updated testing material. I don’t want to spend months studying outdated material