So, if you want to manually change it I can recommend you use this: https://f95zone.to/threads/renpy-save-editor-v1-6-1-last-moment.6456/
Its pretty user friendly and all of that and I find it easier to use if Im not going to fuck up stuff like variables. So, cash, corruption and grades (not sure about this one) should be fine.
You just have to load an existant save and search for what you need, save it on the program and after that load that save that you edited. For cash need to have gotten paid at least once before editting it, since it wont appear first.