Cheats for the app of high school story?

I have an iPhone 4 iOS 6.1.3 are there any cheats for that app, maybe to get in app purchases for free, im so frustrated.

No there are none that i know of

Well you can go into your IPhone settings and manually push time forward to get missions and other things done faster without using rings, but if you do it too many times you will be put in Detention