which is the toughest,hardest and the most difficult course in the field of finance?

I agree with above views. However, if you are an intelligent person, no course is tough for you and vice versa.

I vote for CA too!! It is also given its value.

All courses are hardest and difficult untill and unless you study hard with your full interest.but both ca and cfs is tough.my sugesstion to you is that don't think of hard or easy choose your course wisely and in which you have interest and which is best for your career graph.

I think CA with 3.5 years of training along with few other trainings too.

CA or ICWA are two reputed courses