@Sophie Westbrook Most of the study materials for Admin 201 is referring Salesforce Classic UI (not Lightning Experience UI) in hands-own training and exercises.  In certification exam, will it be based on the Lightning Experience or Class? Or does that matter for the exam?  I enabled the Lightning Experience, but then it is difficult to follow the exercise instructions in materials that I have. Even in the Dreamforce 2015 Hands-on Training (HOT) package that I purchased, the sessions use Classic UI. My question is when studying for Admin 201 exam, should I enable Lightning experience while doing exercises?