It sounds to me like you need to carefully consider the purpose of the homework you're assigning. Is it to teach content-area knowledge, or to practice content-area reading comprehension skills? Certainly it can be both, but if students are not comprehending the text, then they're not learning information from it. If you continue what you're doing, with points for effort rather than correctness, then the homework is providing practice in content-area literacy skills. However, for many students, it's not improving their content knowledge or understanding. If you want the homework primarily to teach/reinforce core knowledge and concepts, then you need to change things up. One possibility is providing an alternative text that your less-skilled readers can comfortably read and comprehend. Then those students will have a better chance to learn the information and understand the ideas. Or you could provide some supplementary materials to go along with the text. What is it about the text that the students are having trouble with? Is it the vocabulary? Or could it be that the students don't have the background knowledge to make sense of the concepts? If you can begin to pinpoint where their confusion is starting, you can go back to basics and start scaffolding the skills and/or knowledge that they need.