What type of figurative language is used here?

It is no doubt that the correct answer is hyperbole.

Hyperbole is a figure of speech that shows emphasis on something through extreme exaggeration. In the given sentence, the speaker is saying that she had so much homework to do and she will be needing a pickup truck to carry all of her books home. No student ever has given by the school or university books to study that can fill a pickup truck.

She might be only trying to say that all of her teachers or professors have given them assignments or she might be working on 2 or 3 subjects but needed to do a lot of research. This figure of speech makes the language more colorful and can expand someone’s vocabulary.