Various kinds of central lines, ports and long term access. Routine care, how to access, size of syringe to use, etc.
Anti-emetics and pain medication
Other conditions you'll likely see: Brain cancers: Neuroblastomas, gliomas and medulloblastoma. Wilms Tumor, osteosarcoma, rhabdomyosarcoma, lymphoma (Hodgkins and non-Hodgkins), thalassemia, hemophilias, anemia, neutropenia and thrombocytopenia
It might be helpful for you to know the requirements to become Chemo certified. You'll undoubtably have to become certified within a certain period of time. Knowing the requirements and how to go about this (how many hours in practice, how many times you have to hang chemo, whether there is a test involved) will show that you're serious about the position.
It's hard to say how to prepare for an interview. Everyone has their own style and system of interviewing. You might not get any clinical questions at all. Most likely they will want to get a feel of your personality, how you will handle working with kids with terminal illnesses, whether you can be professional while being compassionate and empathetic, whether you're a team player who will fit in with their staff.