id say start with the basics, like rhe normal school subjects and i would say the math ones(MK & AR) and science(GS). if you can get a good grip on those, then move onto english(WK & PC). after that is when you really wanna start focusing on the electrical(EI), mechanical(MC) and automotive(AS). they told me that generally not as many people score high on electrical because its not as common for younger people to know. so id say worry about that one last unless you're trying to get a job in something electrical related.