Need suggestions to evaluate my options. Pls help.

Hi. I recently gave GMAT and scored a 630 (Q48, V28). I was really expecting a much better score. English in the exam seemed to be a lot harder than what I encountered during the practice tests. At this stage I don't feel quite confident about retaking GMAT because I had really prepared well and was getting around 700 on my practice tests by the end of my preparation and at this point I am not really sure about how to prepare for it again. So here is a little bit about my background and the doubts I have in mind.

I am an Indian applicant (and I am guessing that makes everything even more competitive for me). I have an average GPA from a decent Engineering college in India. I have 3.5 years of work-ex in a managerial position in a well known global organisation. I also have some community work experience and international exposure of an internship along with decent extra curriculars from my college time. While I am thinking of taking GMAT again, as mentioned earlier, I don't feel quite sure about it. I also don't know if my work ex can possibly give me an edge over my low GMAT score.

I am not chasing the Harwards, Standfords and Whartons of the world. But would want to consider other good colleges like UCLA, Cornell, Ross, McCombs, Tepper, etc. Could I possibly have relatively better chances of getting into to Kelley (Indiana) and Smith (Maryland) - specific question triggered by looking at their GMAT range which includes 630 in these schools vs the other schools mentioned above. Or should i just retake GMAT because it is highly unlikely for me to get accepted any of these schools? Because honestly, I am not really sure if I stand a chance in any of these colleges for that matter with my current score.

Also would anyone know how good are the programs at Eller (Arizona), Krannert (Purdue), Simon (Rochester) and Smeal (Pennsylvania)?

I know there are no right or wrong answers to these things but any and all opinions are most welcome. Thanks.