Hi I am an international student and I really want to come to brynmawr....I even applied this year as a freshman......but was rejected

......( Well i dont really have stellar highschool transcript..my mid year grades were pathetic.)......But after that I strted working hard.......and now I am hoping to transfer to bryn mawr....since i am not much in lov with the college i am going to be attending....
Can anyone plz give me suggestions .... wat shud i do to stand out in the transfer pool? and is it better if I transfer as a sophomore or a junior? does bryn mawr hav any preferences...do they prefer juniors to sophomores or vice-versa?...... any datas....would be welcome..
Thanks