I applied through university. The process took 1+ week. I interviewed at Gartner (London, England) in Sept 2018
Interview
A 64 minute aptitude involving Quant, DI and verbal section and a 90 minute case study was conducted. Further shortlisting was done on the basis of CV and Aptitude score. There were 2 rounds of interview. One with a senior research consultant and second round was with the Director.