Anything related to math is good, we do a lot of trigonometry, geometry and basic calculus. Anything related to drafting and AutoCAD is a huge plus, being able to draft now a days is almost more important than the math aspects. Construction background can be helpful, about half the work we do is related to new land development projects. History related topics are also good, we do a lot of research reading old deeds and maps, and interpreting historic documents. Map reading abilities are also important. Plus all the "normal" stuff, like being able to use excel, word, and communicate like a competent adult.