ACT Reading Humanities

Whenever I study for ACT Reading, it is always the Humanities passage that trips me out. I find it so difficult to read and understand deep meanings like 75% of the time, which is why I always save it for last. Do you guys know how I can get better at this?

Anyone know any good ACT Humanities websites that I can practice on? I’m trying to understand some in http://www.neh.gov/humanities/ but its difficult. Thanks!