I honestly havent read the book but it looks interesting so once i read it I can answer your question
Answer:
Based off of what happened in the text, I would say that the theme of the passage is that some people can succeed with different paths to success. Even though Katie didn't understand the subjects very well, her friend was able to assist her in understanding the topics. Ultimately helping her get to success.
Explanation:
This good? ^
Trustworthiness, honesty, humor