Two weeks is a short time, but doable.
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, you'll learn some tricks to answer some questions that you don't know the answer to.
Also, MASTER OG, this is crucial. It'll take around a week and with hard study, you can finish it. Make sure you check your answers after each wrong one and learn the solution.
Do a lot of practice CATs. GMATPrep is very useful, make sure you solve each of the two tests couple of times.
If you're working as well, I suggest you take your vacation time now. If you can.
Also, get Manhattan SC, you'll learn a lot from this book.