Need help - don't know how to progress = depressed

Hi !

I'm working on the Gmat since Octobre, 23rd for 4/6 hours per day (everyday), and my score is still pretty bad.
I don't know what I'm doing wrong and I begin to freak out because I'll submitt the test in December (21st).

I bought fve books :
OG Review
OG quanti
OG verbal
Kaplan Gmat premier
Kaplan gmat 800

I've reviewed all the Math theories .. all grammar rules and strategies of all books (clearly , I did something wrong ..)
I've finished the two Kaplan books (all exercices..)
I haven't opened the specialized two OG books yet, I'm currently working the OG

With Kaplan premier, I had 5 CAT

1st diagnosis (without any idea about what is the gmat / I didn't manage the time ) : 530 ( Quanti 43% / Verbal 52 % )
CAT 2 : 510 ( Quanti 45% / Verbal 46 % )
CAT 3 : 570 ( Quanti 41% / Verbal 63 % )
CAT 4 : 590 ( Quanti 54% / Verbal 59 % )
CAT 5 : 570 ( Quanti 46% / Verbal 62 % )

and today I did the first test of the PrepGMAT and I had a poor : 590 (Quanti 37 , Verbal 34)

.. I begin to be depressed about this exam ..

I manage my time pretty well ..

my target is minimum 650 and I would be really satified +680

Please anyone could help me to better organize my work for the next week please ?
ps : I even haven't began the AWA and integrative reasoning :'(