Take another look at the sentence:

At the back of the lab, Glenn decorated the margins of his biology textbook with caricatures. When test time arrives, Glenn will wish that he had __________ the different cell types Dr. Shuman was explaining to the class.

The sentence requires the past participle of draw, an irregular verb. Drawn is the past participle.

Verb Simple Present Simple Past Past Participle
draw draw(s) drew drawn

Drew, the form you chose, is a mistake because you cannot use the simple past form with an auxiliary verb like had. Before you continue, review the rules for irregular verbs.

Go back to the sentence to try again.

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