I don't think there is any good university that don't require GMAT for masters. I recommend you to prepare and take GMAT.  Just take 2 regular weeks and study and you will do fine. Don't bother to join kaplan or any of those stuff. Tell you true, they won't help you much. Studying for only 3 weeks won't give a great score but will give a reasonable score. Mind you, GMAT is only a factor not a sole driver to get you enrolled. You cannot ignore GMAT. Gotta have it.