Military Little sister concerned 😧

In concern of my little sister . She took a practice asvab test & passed. Her recruiter told to study auto shop and mechanical section and retake the practice because that would benefit her as well. Now me me being the person I am. I wonder if a high score in those will cause her to get a hard job dealing with mechanics and cars and stuff of that sort when she really wants an office job. I'm thinking he's going to try to make her fill a job that they really need filled instead of what she wants. What sections are the best to study for?