Hey there Friend,
Do you love math?
Whats your background?
Have you studied math for an exam recently?
Answering all these questions will help you with what books to refer. How? Here's how?
1.)
Have you studied math for an exam recently?This will help you answer what topics you need brushing up upon. If you gave no exams, probably you did not study algebra or geometry recently. Maybe these topics did not figure in you daily work and you need to know them ( Q: Whats the volume of a pyramid when its enclosed in a cube with the same base?)
Soln: See the 8
MGMAT books, and select the ones you want to tackle first. If the word, "Permutation & combination" is Valyrian for you, (GOT reference) then "Foundations...."
MGMAT is for you.
2.)
Whats your background?So you brushed up all the topics, remember the formulas, and generally, what the question is about. But, are you someone who will miss and fail to notice the subtle info in the question stem, or fail to quickly notice this very commonly tested concept of maths. (Q: Do you know the solutions algebraic equation need to be put back into the equation and tested for validity?)
Ans: If you have a Quant background. Then this is easy and you don't need to think about it. Other wise no books can help you, only exposing yourself to many questions will do.
3.)
Do you love math?You want a 50 you say? Good. You have the first two parts done. Now to get to the tough part. The harder smart questions. Which will tell the GMAT adaptive brain, "yes, this fellow can understand what we want". Advanced Quant of
MGMAT will give you the temperament. Mind you just the temperament. But its the last icing on the cake. You don't NEED it for a delicious cake. But if you have it the cakes much more sweeter.
So, there's the 2 cents worth of advice. But before that just give a diagnostic test (preferably, GMATPrep) and see, anything above 42 says, you don't need to read too many books. You have other stuff to work upon like, timing, specific tricks and trials of DS, etc.
Regards,
Avik