The topics covered by Canadian and American DAT are almost identical, with the exception of Organic Chemistry and Quantitative Reasoning which is included in the American version but not the Canadian one. You can take any other course (Chemistry, Biology, Reading Comp, and PAT) and it will work for both

Yes, at the end of every crash course, we provide a 15% discount to purchase a second crash course. We are also rolling out a bundle crash course program, containing all the crash courses in one package, at a 40% in the future

Currently No, but we are working on rolling out such courses in the future