Okay after a couple of months I decided to replay this game out of nostalgia but now I remember why I dropped it. Unless you are lucky enough to be online with enough people, or are a one-man-army, you will get stuck getting the rank 3 jobs. From SR to UR there are 3 Advanced monsters you need to defeat. They take forever, you need to beat each of them like 40 times to get enough materials because drops aren't reliable. TLDR: Save your time and play something else