Hey Barely,
Glad I could help!
I also started off with
OG 11, and I was reluctant to purchase
OG 10 b/c frankly this whole GMAT thing is starting to become quite a financial burden!!!! But I purchased it anyway and I'm glad I did.
More recent versions of the
OG are separated into a "Standard"
OG, a "Quantitative"
OG and a "Verbal"
OG. This is a scam to get you to purchase more books. Whereas
OG 11 has roughly 250 PS questions,
OG 10 has 440; where
OG 11 has 155 DS,
OG 10 has 270. Basically, the format is similar but with
OG 10 you get more bang for your buck so to speak, and the questions are more challenging. I bought a used
OG 10 for like 5 bucks and it's been the most useful book i bought, along with "Bob Miller's Math for the GMAT" for Math review.
Don't get me wrong, having
OG 10 is not the single factor that will make or break your exam. You can still do a superlative practice packet with
OG 11. Some people get 700s and up without either of the
OGs. Personally, I am happy I bought
OG 10 and I wish I had bought it before taking the test the first time. That's just my two cents.
As far as order, I do them sequentially, because a) it is easier for me to organize and remember what questions I have done or haven't done, and b)because I believe the questions are progressively more difficult, so it is good to have a solid foundation of easier practice questions going into the tougher questions.
Above all, the important factor is PRACTICE.
OG 11 is one of the best practice sources, so by all means, keep using it for practice packets. If you do happen to come across a deal for
OG 10, you might want to purchase it too, for extra practice.
