I think if you're looking to work in the accounting field you should aim towards a CPA rather than an MBA. A CPA is so much more helpful in finding a job in general than an MBA. If you already have a bachelors in accounting try and sit for the CPA exam, get a good review course, study well and that's it.
In terms of a good CPA review course, as someone else mentioned in this post, Roger CPA review is a phenomenal course. Highly recommended!!