For entry level jobs, you will likely face the same battery of questions typical in any field, so that the interviewer can gauge your personality, enthusiasm, problem solving and other traits. More specifically, you would want to brush up on your basic accounting skills, financial ratios, etc. After all, a credit analyst is called upon to analyze the repayment capacity of borrowers.
As you gain more experience, the interviewer will likely ask more specific questions to gauge your experience with CRE lending, C&I lending, etc. You may be asked specific technical questions regarding traditional versus UCA cash flow, calculating debt service coverage ratios, etc. Be prepared to discuss examples of your underwriting experience.
Finally, be prepared to discuss how you handle stress, as commercial credit analysts work long hours, with signifact time pressure.