Based on previous posts, the questions may be from Non-functional requirements and not specific to your assignment. So, prepare questions and answers related to NFR and risks involved. Yes, going through the solution is also a good idea to answer any questions related to JEE architecture. Part 3 actually tests whether the assignment is actually done by you.
SCJP1.4, SCBCD 1.3, SCWCD 1.4, SCEA 5, JLPT-N3