Options were not provided. Given the content of the text, a subjective answer will be;
Other synonyms for this word are attainable, feasible, and possible. In the text, the author is trying to explain ways in which students can achieve success in school.
Setting personal rules that are in harmony with the student's goals and following through on them will help them achieve their goals.
Therefore, Achievable is a good option for the blank space.
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