Hi,
Here is a link to the latest FAA PTS
http://www.faa.gov/training_testing/testing/airmen/test_standards/media/FAA-S-8081-10C.pdf
It will give you a good idea of what you need to know and from there you can determine what areas you feel weak on.
Some of the texts required to brush up on these topics are available online for free e.g weigh & balance can be downloaded as can Aviation Weather Services...I think, not sure.
I don't want to promote piracy or anything but if you are strapped for cash then you can download Jeppesen's chart training course plus the entire JAA ATPL course of manuals entirely free from any of the Torrent sites.
Good luck.
D.O.G