We designed EPLtest primarily for future pilots. This is why you can use EPLtest even without an Internet connection, for example when you are flying.
Of course, your averages and rankings relative to other candidates can not be calculated offline. When you are offline, your results are set aside to be saved to your account as soon as you find a connection to the Internet. You will then get your ranking at this time.
How to go offline?
You must have logged in at least once to your account from the application, while having the box "Automatic connection" checked.
Without an Internet connection, when you log in, a "Skip Offline" button will appear. You just have to click on it, to begin your training.