I am currently trying to raise my PM's Battle strength and it is taking a while. The quickest mission I have thought was the Lvl 1 C rank mission, since it always increases a PM's battle strength by 24% everytime you get an S no matter what mission you do.

Since I am a noob at this, I dont know about many missions and was hoping that someone on here would know of a really fast mission I could do. Got any suggestions?