A lot of great reference books for GRE that deal with physics come with various online references. These online reference websites also contain free pdf sample test paper download.
The students can log on to these websites as per their convenience with the password given in the book and get themselves registered. After successful registration, they can get GRE Physics Sample test papers free pdf download, reference materials, study sessions, practice tests and much more.
One the student registers themselves, they can even track their progress online and see for themselves the rate at which they are improving as well as how much they can score from the amount of preparation that they are doing. Which is why the students should only invest in some of the best reference books for their GRE preparation, even though these books are costly, they are worth the investment.