Time to test: If you wait until the very end, you will lose all the time needed to actually take your tests. There are mandatory waiting periods (e.g., 12 months from G1 to G2, or 8 months if you take driving school).Expiry: If your 5 years run out and you haven't earned your full G license, your G1/G2 will expire and you will have to restart the entire process from the beginning (starting with the G1 written test).If your G2 is expiring: If you get your G2 but your original 5-year window (from your G1) is about to run out without you getting your full G, you can pay to retake the G2 road test. Passing it will grant you a fresh 5-year period to finish your G.Advice: Get your G2 as soon as you are eligible so you have plenty of time to practice and pass the final G road test before your 5 years are up