Hey, guys
As others have already said OG 10 overlaps a great deal with OG11 and the two supplemental math and verbal books, so not necessary to use both.
Greatman, have you been analyzing your practice questions after you complete them to understand both why you are getting things right and wrong and how the questions are constructed? That is the real secret to your prep - just doing a bunch of questions without analysis won't get you very far. It's like learning a sport - if you don't really know how to play but you just keep doing what you're already doing over and over again without learning the right way to do it... all you do is reinforce all the bad habits you have rather than replacing them with good habits.
When analyzing a question (whether you got it right or wrong!), ask yourself whether the way you did it is the way you want to do it on the test (even if you got it right, you might not have found the best way to do it). If you don't want to do it the same way, figure out how you do want to do it next time you see a question like this one. If you got it wrong, figure out why you got it wrong. Was it content - such as forgetting a formula or grammar rule? Or was it process - such as getting "tricked" or pulled away from the right answer for some reason. If you understand why you make mistakes, then you can correct the situation next time you're about to make a similar mistake.
Finally, you want to be able to recognize a question of that type again if you see one. The testwriters do use certain templates for multiple questions and, though the details will be different and you'll still have to solve each problem individually, you'll be a step ahead if you can recognize that you've seen a similar problem before and remember how you tackled it last time.
Re: ManhattanGMAT resources, we also have simulated CAT practice tests - I am biased of course, but I think they're great and my students have reported so, too - and an online course which covers the exact same curriculum as the in-person course but for a lower cost (lower overhead). We also have corporate discounts for a number of companies; you might want to check with your company or our office (800.576.GMAT or
[email protected])
We have a strategy guide similar to SC for RC - though you might want to wait until Feb when we are publishing a new, expanded version. (Right now, RC and CR are together in one guide; in Feb, they will each get their own full guide.) You can ask the office for the exact publishing date - not sure if it will be early or late in the month.
For DS, we don't have one book that completely addresses the question type, unfortunately. We have 5 math strategy guides which are organized according to content (algebra, geometry, etc.) and which cover strategies for DS and PS within each content area. And, of course, the class (whether online or in person) covers DS strategy thoroughly throughout the 9 weeks.
Good luck with your prep!