Its not true that B-schools want experienced candidates..its just that candidates with work experience are preferred to candidates who are out with no experience. This is primarily because of the fact that a person who has worked for say, 2 years, must have gained something out of it and learned how to work in a particular situation. B-schools provide us a platform in the corporate sector and words like 'stress', 'experience', 'interpersonal skills', 'creativity' and 'smart work' - all are synonymous with corporate sector. So when you have worked for a span of 2 years with a particular organisation, you get more mature, learn to handle stress, learn to use your creativity - and in all you become more eligible to fit into the corporate sector.