What will i need to become a police detective in the UK?

hello. i really want to become a police detective for the Met or Scotland Yard. i know the basics like i have to be a street constable for two years then put in for a transfer. and then i have to do more training and exams, im just curious about what exams and training il have to do. im 18 and still able to go to college, so im just curious about what sort of preparation i can do. i really want to be a detective dealing with homicide or vice cases.