If you have applied within the last two years, you do not need to submit new supplemental materials (GMAT score report, transcripts, and recommendations) because we will already have them on file. The only requirement is that you submit a new application form, new essays, and application fee. The reapplication essay should explain the steps you've taken to improve your candidacy since your last application. Although it is not required, you may want to submit new recommendations to the extent they provide insight into what you have done since your last application.
If you applied more than two years ago, you will need to submit an entirely new application and provide all required supplemental materials.