Which parts of the asvab should I focus on to become a marine combat engineer?

I have visited a number of sites and keep getting conflicting details. The site military.com says it's numerical operations, auto and shop information, mechanical comprehension, and electronics information. About.com and instantasvab.com says general science, auto and shop, mathematics knowledge, and mechanical comprehension. And I can't find it now but I also read somewhere that it was paragraph comprehension, arithmetic reasoning, mathematics knowledge, and word knowledge. I'm seeing my recruiter next week but I'd like to have this information before so I can better gauge where I am and what I need to do.