Premium is available monthly, quarterly, or annually. Annual is the best value if you're studying over several months or working toward more than one certificate.
Upgrading and proration
You can upgrade anytime and pay only the prorated difference for the rest of your current period — you're never double-charged for time you've already paid for. Premium includes every exam, so you don't buy tests individually.
Promo codes
If you have a promo code, you can apply it at checkout, or use a pre-applied link (the discount shows up automatically). See current pricing and any active offer on the upgrade page.