Generally, MCAT scores are good for three years. Therefore, if you took the test in 2003 and did well, you can apply for admission in 2006 with that score. If you took the test in 2003, they won't look at the score for admission in 2007. You should also know that taking the test in April or August doesn't matter. Scores from the April 2003 MCAT and scores from the August 2003 MCAT are both valid for admission in 2006 and invalid for admission in 2007.