Amazon.com and Study.com sell science practice tests, as of 2015. Tests are available for subjects such as chemistry, biology and earth science. VarsityTutors.com provides free science practice tests.
Find science practice tests on Amazon.com by typing "science practice test" in the search bar and then clicking the Search icon. The next page displays titles of science tests, descriptions and links to purchase.
Find science practice tests on Study.com by clicking Science under the Subjects heading on the home page, choosing a subject on the next page and then clicking Exams. The website allows visitors to access tests and other materials for free by creating a five-day trial account.