When you request for GMAC to send your scores to your schools of choice they will send any score you attained withing the past five years...you cannot tell them which scores to send and which not to send. Schools, however, will evaluate you on the score you tell them to consider when you apply. For this reason, it probably goes without saying that you should always ensure you tell the adcom your score (obviously highest). In short, while they will be able to see all your scores, you will only be judged on your highest score and having some lower scores in the mix should not affect your application in any way. Good Luck.