An informal test called the SNOMED CT Challenge is available on the E-Learning Server. You can take this test using an anonymous account but if you do this you will not be able to track your results as these accounts are shared. Alternatively, you can login to the server to take the SNOMED CT Challenge. This allows you to track your results over time.
If you don't have an SNOMED CT E-Learning Server account you can create a new account.