PPL Tutor has been designed around the UK exam system, however flying regulations and hence syllabuses are largely similar around the world. Although content may not be 100% relevant, or cover everything in other territories, the application may be useful anyway.
Our advice in this case is to try the free Air Law exams and content and then make a decision after you have taken this exam to see whether PPL Tutor will be useful to you.
As always, take advice from books and if in doubt: ask your instructor!