For actuarial degrees specifically, most firms do require a mathematical degree, at least for the big four, which could be possibly mitigated by having a certain qualification. However, for other service lines such as Audit, Management Consulting and Tax, it isn't necessary. Prior to where I will be working in September, I worked as a Corporate Governance analyst for around 2 years which gave me a bit more of a financial background, but for my degree I did Japanese and Korean as my degree and had no real background in economics or finance, but now I will be starting as a Tax Consultant (Japanese services) at KPMG from this September. If you research the company and role well and intensively, and educate yourself from the basics to the more broad conceptual details of the service line you are applying for, from a knowledge/experience point of view, it is a sufficient level to have to land the job. Any other prior experience you can gain which is in a similar field and has transferable skills towards your desired role is also helpful.