Since the OG is devised for the average test taker, if your level is above the average (somewhere around mid 500s), then the book will seem easy. Most students agree that the OG contains largely easy and medium difficulty questions. There will of course be some value out of working through them, because you get used to the structure of official problems. However, the book is not at all exhaustive - particularly at an advanced level.

Beware of unofficial problems: not all of them follow the structure of the test, unfortunately. Fact is, there are two possibilities:
- the questions you saw are not exactly GMAT-style, which is something you're not used to
- the questions are indeed more difficult so you'd best be looking for some other source of challenging material for your practice (some people recommend the Manhattan GMAT CATs - I myself have only taken two of them and found them quite difficult).

Greetings,

Thank you for your time and advise.

For the lack of time, and immediate unavailability of Manhattan material in my area, I think I might have to stick with the few Kaplan problem sets that I have for more advanced problems.

Therefore, Ill stick with the OG to get a feel of GMAT-style questions, while doing some KAPLAN to make sure im ready for more difficult questions down the test.

Wish me luck

Thanks again and best regards.