In general, it is difficult to find a job when you don't have the work permit already. However, it is dependent on the perceived value you can bring to the firm. If you are a career changer, it will be more difficult. If you have some unique combination of the qualities and experiences some firms are looking for, you will certainly have a great chance.
From what we heard from some recent grads, in England, it has been difficult. Some excellent Indian graduates from recognized b-schools such as Cambridge Judge returned to Asia (Hong Kong) for full-time positions. In the US, if you have some relevant experiences under your belt, if you keep looking, you may find a good job.
The best way is to check the job placement stats and talk to recent grads of the schools you are interested in.
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