Please contact UCAI (firstname.lastname@example.org) if you are a UChicago student who has registered for an actuarial exam and we will try to assist your preparation efforts.
Here is a collection of some solid free study materials that we found online:
SOA/CAS Exam P Sample Questions (123 questions)
EXAM P SAMPLE SOLUTIONS (123 questions)
Spring 2012 MLC Exam (Practice test)
Spring 2012 MLC Solutions (Practice test solutions)