Manhattan 5th Edition but OG 12, questions for each section?

[dannygill928]

I have the Manhattan Guide 5th Edition but the Official Guide 12. I am trying to figure out which questions to practice in the OG Guide that relate to the corresponding Manhattan 5th edition section such as number properties. Does anyone have a mapping of this?

Or should I just buy the OG 13 since the 5th edition spells out what to practice? My issue with this is I feel like I might as well buy the newest 2015 book. However, the problem with that is that I still wont know which questions I can use to practice each section I am currently studying.

[RonPurewal]

"the newest 2015 book" is exactly the same as og13. the only difference is the availability of some additional online content with the new book.
(i don't even think there are new problems; i think the new content simply reorganizes existing problems into problem sets, or something like that.)

[RonPurewal]

you should just go ahead and buy the book, though. if you're on a tight budget, check amazon for used copies—at this very moment, i'm seeing some for as little as 7$ including shipping.

in each edition, some problems are purged and replaced with other problems. that process isn't random—the problems that are removed are removed for some decently good reason—so, it's always a good idea to have the latest edition.