You're definitely fine with those books. The content of the test itself hasn't changed since then.
Our 5th edition guides have an appendix in the back that lists all of the OG questions in each particular topic discussed in the book. For example, in the Word Problems book, you'll find a listing for all of the Rates questions in the various OGs.
Since we didn't want to have to update our books every time a new OG came out, though, we now have all questions listed by topic in our GMAT Navigator. So, you can use any edition of the OGs in conjunction with our books.
You should have access to Navigator if you purchased your books through Mprep. If you didn't, you can get it here:
https://www.manhattanprep.com/gmat/stor ... navigator/
If you have any questions, please don't hesitate to reach out to our Student Services department:
[email protected]
Good luck!
