Dear op,

Bank jobs are pretty generic. They're not so specialized. You can study any course to work in a bank and you don't need a post graduate degree.
Contrary to popular beliefs, bank jobs are one of the easiest to get on merit (without connections) but a number of factors come into play:

1. Your age: most banks set the entry level age limit between 24 and 27 years

2. Class of degree: 4 out of every 5 banks will require a minimum of 2:1

3. Aptitude Tests: This is what disqualifies most candidates. A lot of graduates know next to nothing about aptitude tests. They could take a number of formats:
-GMAT
-GRE
-SHL
-Abstract Reasoning
These tests require a lot of practice to build proficiency if you don't have a math background. That's why you find a lot of engineering graduates in banks

4. Information
Almost all banks recruit at least once a year and these opportunities are posted on several job sites

5. Assessment Centers
This involves group discussions and tasks that usually culminate in a presentation by members of a group. Your presentation skills could stand some improvement

In summary, banking may not as attractive as it used to be in the early 2000s, however it can serve as a launch pad into the corporate world. It is also worthy of note that there are other departments in the bank asides operations and marketing. The best time to start preparing for a bank job is while you're in school. Learn about the aptitude tests, get the best grades you can, learn how to write CVs and cover letters, create a profile on LinkedIn, meet bankers or friends that have siblings or relatives that are bankers.

PS: Feel free to contact me for materials on the aptitude tests