There is a lot of information that by now you should know due to your experience, learn to know where to find them on the documents.
Remember you will be a mentor, guide or reference for the student. Get to know every detail, fact and system of the airplane, students will ask you.
Get proper experience with different procedures on the actual aircraft so you can demonstrate and share them.
Read CAP601 from the UKCAA is a nice guide
And your school must have a sort of MEP manual for students, get through it.
Remember to think as student and what raised your curiosity.