study up on (someone or something)
To learn a lot of information about someone or something, especially in a short span of time. I want to study up on Tokyo before we travel there this summer. I always make sure to study up on any potential candidates before inviting them to an interview.
study up on someone or something
to learn all one can about someone or something. I have to study up on Abraham Lincoln in preparation for my speech. John studied up on seashells.