Government Insurance or Exclusive?

“I’m turning 17 in a couple of months and 16 years-old. I’m currently paying about $435 for insurance in A6 month period. Can that charge decrease after I turn 17″Hello i just passed my test and need to know what Insurance company to choose. Im 25 yrs old. Only got my self Saxo VTR inexpensive on Ebay” He really wants to buy it without calling his insurance cause he wants to spend cash it has been over monthly