In order to become a credit manager you need to enhance your skills in managing credit risk, evaluating financial statements and understanding credit policies. Some courses to enhance such skills are:

1. Finance and accounting

2. Credit management

3. Business and economic

4. Banking and financial services

5.  Management and communication

6.  Quantitative skils like mathematics and statistics.

You can also gain experience through internships in credit departments and financial institutions. Or you can go for certifications like CCP and CCE.