Chalk out your school options before hand,is what i would suggest , most schools have a cut off score in the order of 83 to 85, some like tufts have it in the range of 89 and also give extra weightage to part2 scores, you will have to write in to ASDA to send in your scores directly to the schools u wish 2 apply.and yes, one can retake the test t improve the score , but even if one doesn't fare as well as the first attempt the most recent score is reported.Incase of failure to clear one or more than one subjects you can retest in those particular subjects.iwould suggest going thru the examination guide that comes along with the form. good luck