There is no magic number of practice cases that proves you are ready.

Readiness is better measured by whether you can structure unfamiliar problems, do the math cleanly, extract insights and synthesize without heavy prompting.

A PhD with strong analytical habits may progress quickly in some areas while needing more work on business judgment or communication.

Track recurring weaknesses across mocks and stop counting cases as if volume alone equals improvement.

You do not need to know every industry. Basic commercial logic goes a long way.

I stopped counting cases once I noticed the same two weaknesses kept showing up. Fixing those mattered more than getting to a round number.