Great question! While I salute your ambition and gusto in your quest to pass that road test, unfortunately the only way you can rent a car to practice driving is if you have a valid driver’s license—without one, you won’t be able to rent a car to practice.
If you’re really intent on practicing before your road test, it might be a good idea to contact a certified and well-regarded driving teacher to brush up on your skills before your test. Not only will you get some practice, but your instructor will be able to correct any bad habits you might have developed.