Check tutorials on youtube and change main if necessary to be suitable for the ninjas that you have.

Hello, there are several f2p friendly teams for all the ninja exams up until 180. you can search it in youtube just by type "Ninja exam 114 water main" for example.. hope you will get some ideas and then you can experiment yourselfs for replacing a ninja you dont have similar to the one in the tutorial!! if you have any problems feel free to reply. Btw your power factor is enough to complete them up until 120 for sure