Hi ramalo,
There are numbers of Business Schools in U.S., U.K and other countries which provides loan without co-signer, let us know which B-Schools you are looking for. In U.S. B-Schools like Wharton, Stanford, Chicago Booth, University of California (Haas) and Yale etc. provides loan to international students without co signer.
You may also gauge your chances of getting admission to top business school by trying this amazing tool
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https://www.genedmba.com/webinars-seminars/Hope this helps.
Cheers,