Applied online and completed online numerical test, which is not very difficult and very similar to numerical tests for other companies. Graphical interpretation and lots of quick calculations of percentage growth, percentage shares, etc.
Was then invited to a first round assessment center. The majority of the day takes place in a conference room with about 20 other applicants. This consists of:
1) a short slideshow presentation in a conference room
2) 30 minute numerical test with 25 questions. The questions really aren't complicated, but they really only measure how quickly you can make arithmetic (multiplication/division) calculations with decimals/percentages. Many of the questions are straightforward "calculate this"-type with only a handful looking at ability to read a graph. I found this extremely time pressured, and most people did not complete the test (accurately or without guessing at least). You're told before the test that it is not negatively marked and so to answer ALL the questions
3) 30 minute verbal test with 28 questions. Standard GRE/GMAT-style questions, with half being inference questions about many smaller pieces and one larger piece and the other half selecting the best way to restate the underlined part of a sentence.
4) a group case study. Doesn't seem like they really change up the case since it seems similar to what others have said. Case is about the introduction of a lottery to a developing country. You are given a brief to read then given some time to complete a few tasks. First one is to look at what the government might judge proposals on. Second task which is broken up into subtasks is to put together a proposal for your assigned company to run the lottery. You then give a presentation and are asked questions on your presentation.
5) There's a short lunch after the group case, then a 30 minute writing test where you have to summarize a piece. The piece we were given was about the PoW camp economy and cigarettes as a currency. The instructions are a bit unclear I thought, since all you're told is to summarize.
I found this round to be a bit impersonal. It doesn't seem like they make any effort to get to know the applicants, and at this stage you definitely feel like just a number with some test scores to them. Progressing on to the next stage is entirely dependent on the results of your tests. The next round would have been another assessment center that included interviews and case studies