Transferring to NU for Sophomore Fall 2017

Has anyone transferred into the Northwestern School of Communications from another university? What did you do, any advice appreciated! Am currently a freshman at a liberal arts college ranked in the 30s. Went to a nationally respected academically rigorous prep high school but did not have good grades (reasoning for that though.) Currently looking at a 3.8-4.0 GPA here in college though with extracurriculars related to communications and social activism? What do we think I should do to strengthen my application? Please tell me your experiences!