Hi kreel11,
Thank you for your note. The information you provided is rather wide open (e.g., three or four continents and a 100-point GMAT range), so it's a little difficult to make a definitive recommendation as to which schools you should select on test day. Your question deals with the specific action of "sending score reports to schools," but I think it would be helpful if you took a step back and considered your "school strategy" more generally.
Where do you want to end up geographically after the MBA? Where does each program have presence? Do you prefer large programs (with large alumni networks) or small programs (in which you'll know all of your classmates pretty well)? What type of classroom learning environment do you prefer? What is a given program's strengths and weaknesses? Where does each program commonly send its graduates career-wise? And so on...
There's a pretty heavy research process that goes into developing this school strategy and list of target schools. Much of it is also dictated by how you perform on the GMAT. Your final school list will look a lot different if you end up at the lower end of your stated range (650 or 660) than if you end up at the higher end of your stated range (740 or 750). [Though on test day, you have to choose the schools before knowing your score.]
With that in mind, I would send the free reports to the handful of schools you think you are currently most interested in and likely to apply to no matter what. If you're really not sure about where that might be, then you might consider selecting one school that stands out for your from each continent you highlighted (and perhaps a well-regarded U.S. program of interest to you, should you end up scoring toward the top of your range.)
You might only end up applying to some of those schools, but that will help maximize your "free report" coverage. But don't worry too much about which programs you include as free report recipients. Yes there's cost associated with sending additional scores at a later date, but that's inherent to the application process. The more important step for you right now is to determine which schools you like and fit with, your goals, where you'd like to study, and how that all fits into your application strategy and risk tolerance (particularly once you know your GMAT score).
In short, don't let the fact that you have to choose a few schools on test day distract you from the more important "school research and selection" process! [Two other quick thoughts: Given that you already have an MBA, you will want to confirm that the programs to which you ultimately apply are willing to consider candidates who already have the degree. And you'll definitely want to nail down a specific intended plan and career path in your applications... where do you want the MBA to lead you? why do you need the MBA to get there? why at this point in your career? and how will that particular program help get you there... down to specific courses, clubs, extracurriculars, culture, community career opportunities, etc.]
Best Regards,
Greg