There are 3 stages within the application process before heading into the actual group/partner interview stage. The first stage is if you meet the requirements, second stage is a test on your cognitive abilities with the third being a numerical as well as responses and reasonings to certain situations and dilemmas. The numerical questions will test your ability in probabilities, averages, percentages, finding out 82% of something etc. The responses and reasoning questions consists of writing an email, as well as a few timed video questions which have a 2 minute time limit, but with a 3 minute preparation window. Within that space of time, I feel giving just 1 STAR example answer to your skills and abilities, as well as how you would be a suitable person is more than enough- so long as its rich and explained clearly vs. giving 2 or 3 STAR answers/