Come up with three "categories" relating to what your prompt is asking you, and use this to create one broad statement (called a thesis statement) to tell the reader what the essay is about, within your intro paragraph. You do not have to have an elaborate introduction paragraph will all the bells and whistles. Just simply and effectively state what you want to say about the prompt, including your three categories. In fact your one-sentence thesis statement could be considered your whole entire paragraph, so long as you are able to draw three points together concisely and relate it to a little bit background information on the topic that will help your essay make more sense. It would also be in your best interest if you could use sentence starters such as "In spite of..," or "Despite..," as this will make your writing sound more sophisticated.
Once you have your intro paragraph, each of the three categories you stated in your thesis/intro will now become the focus points for your three body paragraphs (you can call this your "baby thesis," if it helps). In these paragraphs, make sure the baby thesis is clearly stated, and that you give your analysis of the topic you are discussing in this particular paragraph and you are giving at least two pieces of evidence to support your analysis. Since you mentioned reading comprehension, you will want to find articles that relate to this that you can borrow from as evidence to prove what you say, using quotations and citing the sources correctly.
Finally, for your conclusion, you are basically tying everything together in one cohesive, summative paragraph. Basically ask yourself, why do all of these things I have just said matter as a whole? Why is it important to discuss this in the first place?
Overall for essays, you start with identifying three broad categories, each body paragraph is basically a more in-depth look at each of the categories and explanation with evidence as to why it contributes to your initial claim/thesis. Your first draft will not be perfect, that's why it is best to stick to the bare bones of the essay and write until you finish, at which time you can go back to make your adjustments, and if you want, create your "grabbers," correct your grammar, spelling, or make tone adjustments to make your essay flow smoothly.