Well for USA and Canada they common exam tht u have to appear for the DDS is NDBE..tht u msut be knowing by now..
NDBE 1 and 2 exams ..i guess u have all the knowlege abt it..but the main thing is u have to do 2 years of schooling to cop up with the standards..and tht is compulsory.well abt the university its like ,depends on the score of ur NDBE exam..What i have done so far is looked for the best university..go to gogle and try to find the best universities in USA..i can give the name is Chicago..i prefer tht the most..also University of toronto,canada, where i stay..
all the best and ask for any other queries witohut hasitation..
Dr.Dhaval dave