When your payment is complete, you will be automatically signed into your Premium account. You will receive an e-mail with a receipt and your payment details.
All the Premium features will be available to you right away. You'll be signed into your Premium account automatically. Your test progress won't be lost; it'll be carried over from Free to Premium.
Please remember the e-mail address and password that you used to sign up for Premium. You will need it to access your account from another browser, device, or computer.