Consistency in RC

In recent practice tests I have experienced some difficulty with consistency in Reading Comprehension. In some respects this section is a "wild card" of sorts for me in the sense that I had scored as well as only -3 in the section but will sometimes get as many as 8 questions incorrect. However, most times the majority of my incorrect answers come from the last passage that I do not get to fully engage. Has anyone had a similiar experience, and or have any suggestions for solving this issue?