I took the GMAT a month ago but I wasn't very serious about it.
I did all the questions in OG11 once and reviewed my mistakes and that
was it. I ended up scoring 520! Miserable!

I decided to give myself some time and come back when I'm furiously ready!
I spent some time slowly reviewing all the questions in the OG,
the ones I did wrong I did them again, and I took notes of some important lessons.
After I did that, I took the Prep 1 for the second time ( I scored 570 the first time),
and I ended up scoring 670. But a lot of the questions were repetitive.

Now I have exactly 4 weeks.

Here's what I have in mind ( but I need some help please!!)

Books : Kaplan 2009 with cd, kaplan 800, Princeton Review, Mgmat SC
CATS : All kaplans, All PRs, All Manhattan + buying 3 GmatFocus Tests.


Now that could be a lot, so Im thinking of letting go some.
Would it be enough If I studied from the Kaplan 2009?
Can I let go of the Kaplan 800, or does it contain more info?

Same thing for Princeton Review, is it really needed?
I've read some of the topics and concluded that the CATS
are rather good.

What do you guys think?

One last question, are the GmatFOCUS questions different from the software?

Thank you