Compile statistics and research about people who statistically do not do as well on standardized tests. For example, low-income, special education and minority students do not score as well. Use this as part of your explanation for your test scores if you fit one of these categories.
Show past standardized test scores to your interviewer to explain that you consistently do not do well on such exams, if this is the case. This strategy is effective if you have high grades, strong application essays and glowing letters of recommendation to offset the scores.
Tell the truth in a professional, appropriate way during the interview. For example, if your scores are low because you were sick on the test day, explain this. If your scores were low because you had a death in the family and could not focus, explain that as well, and offer to retake the test if necessary. If you did not study for the exam, explain that you had factors such as work or school that prevented you from proper preparation.
Provide the interviewer with a breakdown of your scores in each of the sections that make up the GMAT. If your score is low in just one particular section, explain that it reflects a particular skill set you want to work on in business school.
Discuss cases where students have boycotted standardized tests, such as in Florida, for being biased. You do not need to bluntly state that you feel your GMAT scores were low because standardized tests are inherently biased, but you can allude to those sentiments.