So currently I'm stuck on Ninja Exam 115, most water MC guides use Mei but since she is not a free character, I don't have access to her. I did find one guide where SN is the only requirement and luckily I do have SN but I have been unable to beat the exam.

The problem is, despite having 1k more power than the team in the video had (39k VS my 40k power) the team in the Video had a total Health Pool of 49k vs my 40k total HP, so I can only assume that is where the problem lies.

http://i.cubeupload.com/8S1PY4.png

Since I'm apparently not durable enough, has anyone seen or used other strategies for 115, I am a free player so the Ninjas I have access to are rather limited, but it would be nice to try and work towards beating exam 120 before I reach level 70.

Any help would be appreciated.