What are the strengths that EY are looking for in assurance jobs?

I'd say that the strengths EY looks for in assurance align with that of many (if not all positions) at EY.

People tend to assume that you need to be an expert at Maths for assurance and that you need a degree in accountancy etc. Realistically, we have people from all Education backgrounds join Assurance so as long as you have a decent grasp on numbers and computers, you will be able to succeed.

I would focus more on building your people skills. EY tends to respect those with strong morale values and those who are willing to learn. (We would much rather an amateur who is willing to learn than an expert who isn't willing to participate!) Moreover, you spend 99% of this job dealing with people. Whether it be the external management or the internal team.

Hence, it boils down to: approachability, teaming and respect for those around you. Sounds like a very corporate response but it really is that simple!