Review this knowledge article about the types of things to be inspected in your space. Please see the numerous articles prepared to help you know how to prepare your room and keep your room safe.
Make sure that you and your roommate(s) have a plan to prepare and clean your space.
Set aside some time prior to your scheduled inspection to clean the apartment. This may be a good practice for you and your roommate(s) to do regularly.
If you have any prohibited items, be sure to remove them and take them home, place them in your car, or ask a friend off campus to hold them for you.
Ask questions! Your RA can be a great resource for you to prepare.