Landing a role in social media or social media marketing, does not require a degree, though having these qualifications are always a benefit and can help in the long term with progression. Due to the large competition, experience is arguably valued more than qualifications, so it is important to demonstrate experience in a breadth of social media channels, and be able to give examples of how and where you have done this previously.
A solid understanding of all social media channels is a baseline requirement for any social media job and ensuring you are up to date with the latest trends is also very important. Having a well written CV with industry related keywords and statics throughout is a must.
Qualitative style questions are more common in interviews for social media roles, and the questions are often expected to be brought back and related to the company that you are applying for.