Any tips from those who were able to pass the Part 3 exam for Project Yukon?

I'm currently trying to get recruited for Appen, specifically Project Yukon and I was able to pass Part 1 and Part 2 of the exams. However I tried Part 3 for the first time, didn't make it, took it a second time, didn't make it, now they want me to retry the Part 3 exam again. However it's frustrating and I would definitely like some advice.

On the Part 3 exam (primarily needs met rating based) there's a "comment" button on every slider. I placed comments on several of them but left a few without comments. I'm not sure if they want me to place comments on the sliders or not, they don't say to.

Help would be appreciated, thanks!