People should be allowed to keep their money and use it for the things they want.
The word “things” in this sentence is used as a direct object and not as a possessive. There is no need for an apostrophe, as the “s” is simply pluralizing it.
The young men were students at the Boys’ Latin School.
The apostrophe should follow the “s” in “Boys,” as the term refers to more than one boy.
In the chapters that follow, you will learn how to approach the two basic types of Analytical Writing tasks on the GRE. The Argument task will ask you to analyze an incomplete argument, while the Issue task will oblige you to come up with one of your own. Although each type of task requires you to approach an argument in distinctly different ways, both are built on the foundations you studied in this chapter.