i have no work experience and have a degree in economics from the uni of delhi.i have scored a 660 on the gmat .i have the following schools on my radar-
warwick business school
cass business school
esade
ie. business school
ivey school of business
bocconi university
queens uni in canada
melbourne business school
my aim is to work in a management consulting firm abroad .which of these schools would suit my aim?

Why not look at the FT MSc ranking? If you don't already speak Spanish or Italian, then exclude schools in countries where English is not the business language.

ESADE has a really good program, but like Duncan mentioned it would be hard to work in Spain after graduation without knowing Spanish.

The UK programs are also well-regarded, but international students often run into problems converting their student visa to a work visa, which requires sponsorship from a firm, before graduation. This is harder than it sounds.

If I were you I would limit my search to ranked MIM programs in English-speaking countries, keeping in mind the visa restrictions in the UK (unless of course you are fluent in some other language you haven't mentioned). In Australia, there's the University of Sydney, for instance; in Canada there's UBC - Sauder.

In the UK, the LBS program would probably best help meet your goals, due to the school's reputation, the strength of the program, and its connections with recruiters.