In order to download free GRE Chemistry sample test papers in pdf format for free, the students can search for reference material and online forums websites. Most of the reputed online forums would contain links to websites that would help the students to download free sample papers.
Make sure you search only on the sites of high repute, the way you can check this is by looking at the number of members on the forums, the number of threads, the level of interaction on these threads and the quality of the questions that are discussed on these threads. Once you are satisfied with the quality of the forum, look around for threads asking for sample papers. Chances are someone would have already raised the question, and you can go through the links that are provided. If you do not find the link, you can always raise a query yourself and get the answer.