Research which testing companies offer at-home test scoring positions. Pearson and the Educational Testing Service are two companies that are known to offer work-from-home test grading positions. You can also check job listings or do a search on the Internet to locate more opportunities.
Review testing companies' qualifications for test scoring. Scoring tests requires some background in the area for which the tests are given; for example, to grade literacy standardized tests, you'll likely need to have experience teaching literacy.
Fill out the online application. Once you determine that you have the qualifications to grade tests from home, apply for the position using the chosen company's online application form. You'll likely need to include information such as years of relevant experience and what type of experience you have grading tests.
Ensure you have the proper equipment and programs to grade tests from home. You'll likely need to have specific programs to access the tests, if the company hires you. If you don't have the appropriate equipment and programs, obtain the necessary materials.
Reserve a quiet area to work from to ensure you will be free from distractions while grading the tests.
Follow the company's procedures for grading tests and send the graded tests back in a timely manner.
Note that grading tests from home, while certainly a means of income, comes in waves; you may have plenty of work at one time of the year and no work at another. Make accommodations to supplement your income during down times.