The "Learning Focused" way
Decide what the fundamental question that the passage will answer and formulate the "Essential Question." Preview the new vocabulary; for the most challenged readers, you might preview the new vocabulary sooner than with the other students if you are able to differentiate your instruction. Use a graphic organizer for students to take notes on. Most text book publishers provide custom graphic organizers for each section of the book. Preview the headings and boldfaced words. You might preview the questions at the end of the section. You can look at the pictures and charts that are in the passage. All of this prereading can be very time-consuming. If it takes up all your social studies time in one period, you could have the kids write a summary of what they have learned just from previewing. Have them predict what they still will learn and to formulate questions that they might get answers to once they have read. This kind of writing might make a great "ticket out the door," or a piece of work they turn in on the way out of class.
Once you have previewed the passage thoroughly it's time to actually read. You might allow the students to read in pairs while they fill out the graphic organizer. Once the reading is completed, have the students answer the essential question. I used to require the students to answer the question in paragraph form. Before the kids actually wrote the paragraph, you might have a prewriting session and write down salient points on an overhead during a class discussion. The kids can use the notes on the overhead to compose the paragraph. Have kids read their paragraphs orally and you can help them fill in any blanks they might have overlooked. If kids read aloud, you might record a grade right then and there to save yourself from having to read all the paragraphs later.
You could take the questions from the test and make up a quiz show game to prepare for the test. You could prepare a matching game to reinforce the vocabulary. Often workbook pages accompany the text to reinforce social studies skills. I recommend taking advantage of these resources!