Psychweb offers the following timeline to guide you in planning for graduate school. John Suler, of Rider University, offers this guide to getting in graduate school and to careers in Psychology. Applying for graduate school can be very confusing. Look here for a list of useful books on graduate school for various areas within psychology as well as related disciplines. APA's Education Directorate has answers to these and other frequently asked questions about education and training in psychology.
Lower scores are acceptable for many masters programs.
The best early predictor of your score on the GREs is your performance on the SATs. Look at Mayne et al. Norcross et al. Princeton Review has excellent suggestions on a range of graduate school issues , but I especially like their suggestions on preparing for the GREs. These include information on the format of the exams , strategies for taking the GRE CAT , and even the particulars of past exams.