One way is to sum up your third body paragraph with some reminders of your other paragraphs.
You don't need to restate the topics fully (that comes in the conclusion) but you can refer to a detail, or example, or character as a way of pulling your ideas together and signaling that you are getting ready to conclude.
You should also be able to summarize data, distinguishing the most important features.
Such assignment helps to improve analytical, writing and reading skills.
You should try to use details and specific examples to make your ideas clear and convincing.
Your conclusion begins with a restatement of your main point; but be sure to paraphrase, not just repeat your thesis sentence.
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In case you want to cope with the assignment on your own, go on reading and learn how to write a 5 paragraph essay without any worries. It is a very common assignment both for high school and college, which aims to check your written skills, as well as abilities to analyze and put your thoughts on paper.
The thesis should tell in one (or at most two) sentence(s), what your overall point or argument is, and briefly, what your main body paragraphs will be about.
For example, in an essay about the importance of airbags in cars, the introduction might start with some information about car accidents and survival rates.