The best tip for preparing is to know yourself and if the job is right for you. People at the firm have a variety of backgrounds but generally share common ground in personality, aptitude and innate skills. Employees mostly come from Econometric or Financial educational and professional backgrounds, but many are math, physics, science and even humanities and history people. The job requires you to be comfortable with IT systems, well-versed in financial markets or at least willing to learn them deeply (many people come in with no financial background and I personally had no professional experience in the field), and crucially you must be good with numbers and problem-solving, particularly under pressure. If you are right for the job, it will show in the interviews, and if not then you wouldn't be happy here anyway.