Strategy for a Good Score in GMAT

Hi all ,

I am a new member of this forum , as well as a new GMAT aspirant .Can any one suggest me a good strategy in order to get a score of above 700 in GMAT . I am interested in preparing on my own without any external courses . I want a general strategy and can anyone suggest me books to refer and good sites for practice tests.I am planning to take up Gmat in JAN 2009 .

Regards,
Amritha