Do you also cover your (grand-)child (under 25) on your policy? Are you a (grand-)child of the primary insured person?
Is your student doing well? Are you a good student? (generally requires a B average for a full-time student)
Did you complete the driver training course?
Are you a member of Military?
Have you graduated recently?
Are you newly married?
Have you recently moved?
Have you recently retired?
Are you looking for employment full-time?