I would recommend the MGMAT guides
, and even if you don't want to spend the money on all 8 of them, if you just pick up one focused on geometry, you get all the tests. Certainly worth it. I would recommend these as I've heard that they will give you the necessities to build from the bottom up and develop a strength where it was previously a weakness.
Here's the link to picking it up on amazon:http://www.amazon.com/Geometry-Strategy ... 852&sr=1-1
for less then 15 bucks, certainly worth your while to focus on geometry if that is your only concern.
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