I bought the book.

Supposedy Stacy Koprince from MGAT says there are around 300 problems that are not previously covered in OG11 or 10.

I solved about 100 problems so far but looked through the rest of the problems.

I solved OG 11 last year and OG 10 this year.

So far, my educated guess tells me that there are more than 300 problems that have been not previously covered.

I think at the least 1/2 the problems are new, if not more.

Of course the only drawback is that the Q on the OG, as usual doesn't prepare you to get over 90% on the actual Q on the real thing.

But the V should be sufficient in preparing for the real test.

Final prognosis : A KEEPER, WORTH BUYING (or buying from Barnes and Noble with cash, saving the receipt, and returning for a full refund within a week)

but even worth buying even if you're not gonna return it.