I had the same experience as you last year.
I practiced for a month and got a 500, then after some time I managed to improve to 580. It still sucks, but at least it was something.
I think you will need more than a month to prepare and imporve your score. I think a 3 month period is more suitable for this kind of exam. I do not know your target, but take it slowly and practice a lot.
To prepare for Math, try to do Kaplan
and review posts on the forums. Normal books are very old and do not have actual excersices.
For verbal, try Princeton verbal workbook or Kaplan
I hope this helps