After the application form was submitted, I was invited to do a series of online tests. Very soon after, they called me telling me I'd passed and set up a phone interview. The phone interview was a case study and we were given materials before hand. This was fairly simple, requiring conceptual knowledge and mathematical skill. Make sure you brush up on marketing techniques and algebra! Again, very quickly I was told I passed and was invited to an assessment centre. The assessment centre consisted of a 1:1 job fit interview, another case study (much more difficult than the first one! Don't get flustered and practice conceptualising problems with graphs and going through equations - they take either approach), and a group presentation. They are looking for a culture fit, so relax and be yourself! They're not a stuffy institution. At the group presentation, we were asked to introduce ourselves with an interesting fact. My fellow candidates talked about previous internships and projects, while I mentioned I made balloon animals. I was the only one with further questions! After a few days I was told they'd like me to come back for a final round interview! This consisted of a final case study even harder than the others. Unfortunately I got flustered and didn't perform as well as usual (so make sure you keep calm and focus on your work). I was not given an offer, but the overall experience was very positive! They really help you through each stage of the process and encourage you to relax.