In general, if some of the Premium practice tests are still locked after the upgrade, it could be due to the relative recency of your purchase, so hard-refreshing the page should help.
Steps to follow:
Refresh: Press Ctrl+R (simultaneously) or Ctrl+F5 on your Windows computer, or Command (⌘)-R on a Mac. If that doesn't help, try hard-refreshing via Ctrl+Shift+R.
Check if you're signed in: Check if you can see your name in the top right. If not, you're signed out and need to sign back in (depending on your browser settings, your session could have timed out). To sign back in, click the "Premium login" in the top right on any desktop site page. Enter the e-mail you used during registration and receive a sign-in link.
Switched devices? Sign in: If you purchased from a mobile device, but are trying to practice on a desktop computer, there is no way for us to know you have upgraded. In this case, you need to sign in on all new devices you would like to keep practicing on. Please see the steps above.
Double-check your purchase: The SIM package does not include access to officially licensed MBE questions. These questions will remain locked and require separate purchase.
Send us an email: If none of the above helps, send us an email at info@barprephero.com, and we'll get back to you as soon as we can!