I couldnt get it !
your brother is a trainee engineer at PIA and doesnt even know anything about licensing procedures ? well I do not know any trainee currently serving PIA with a foreign qualification; the only one I know had left PIA few years ago for USA. HE was disappointed at slow career progression, nepotism, being frowned by the technician *** matric pass engineers and the jealousy shown by the peers. Even the current Director Engineer doesnt hold a bachelor degree in Engineering
anyways, lets just stick to the main topic regarding B1. There are 16 modules: module 1 -10, module 11, module 15 and module 17. He has to pass all of these. To appear in B1 exam, he needs to show 5 years of experience without having any technical education, and probably a year or two if he has done engg from one of the recognized university (thats criteria for CAA UK B2, but please cross check the information)
he can take exams at any of the EASA approved 147 institute around the globe; candidates prefer to go to UAE or Malaysia, because of its close proximity to Pakistan. But your brother can go into designing as well and as far as I remember Canada is home to one of the oldest manufacturing industries when it comes to aviation. A licence is only required when a person is working for an airline or any MRO.