It's difficult to give you a recommendation because I don't know your score breakdown. Is it heavily verbal skewed? If it is, you may benefit from Total GMAT Math. I am using TGM right now as my most recent score was decent but was skewed verbally and I felt I needed a thorough review of the core concepts. It helps that a lot of the practice he gives you are adaptations of OG questions, this is one thing the
MGMAT books doesn't deliver (I have the whole set of these as well). If you're scoring high mid-to-high 40's in quant I'd agree with BM and say that you probably just need more thorough
MGMAT review, maybe Jeff's 1800 questions and the Club tests.
But, in my situation, I have the
MGMAT books and decided to give Jeff's book a try and really love his approach. I will use it in tandem with my
MGMAT books once I am comfortable with the concepts and examples to go over the stuff that is still giving me trouble but I feel that TGM is a great resource.
I have yet to take a CAT to see if there has been any improvement as I'm trying to master all of the concepts first, but in attempting practice questions, I am noticing an improvement.