...don't be shy about touting your child's grades to your insurer. Most companies offer "good student" discounts. For instance, State Farm takes 9% to 35% off a premium, depending on the student's gender and whether he or she is kept on the policy as an occasional driver or is at school...
Knowing this, make sure to ask your insurance agent if they offer discounts for good-student drivers. Many insurance companies won't give up this kind of information, so you have to ask for it, and at up to 35% - it's worth it.
I did a bit of research and found the providers which have good student programs, along with the conditions to qualify.
Geico's good student discount
Sometimes it pays to be a smarty-pants. Full time students with a good academic record could be eligible for up to a 15% discount on certain coverages. (In most states, policyholders between the ages of 16 and 25, who are full-time students with a "B" average or better, are eligible for this discount.)
Good Student
If you're 25 or younger, unmarried, and a full-time student who meets our GPA requirements, you could save on your auto insurance premiums with this valuable discount. (In some states, the qualifying age is 21.)
Progressive offers a good student program, but it varies by state. You'll have to call them for details. Progressive's car insurance FAQ
Esurance's good student discount
Being a good student doesn’t just mean proud parents and a successful future, it could also mean auto insurance discounts! Whether you’re still in high school, or getting a college degree, Esurance wants to reward you for your hard work. In most states, we offer auto insurance discounts if you're under 25 years of age, maintain a 3.0 ("B") grade point average or better, and are enrolled full-time in high school, community college, or university.
Statefarm varies state by state, but they do have a good student discount program. (You'll have to fill out the form or call them for details). Full details
