Verb Tenses. When Marta registered at her new college last semester, she (need, not) to take College Algebra again because she (take, already) that class at her other school.

When Marta registered at her new college last semester, she don't (need, not)  need to take College Algebra again because she (take, already) already took that class at her other school.

Explanation:

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it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.