Using Water Main.

I tried this line-up from Btrues video, which didn't work- Hinatas' mystery barely blocks the first incoming attacks & most of the time she dies round 1 then I reset, but her dying round 2 makes no difference anyway.

Next I tried this one, from another video- but apparently either the Exam is weaker or my ninja are significantly weaker than from the video because they damage my Ninja way more than the line-up I took from the video.

Finally this is my usual line up, but this doesn't work either, the water main just dies round one.