Any desktop or laptop can be used to access the tests directly from the server. Recommended browsers are Google Chrome, Mozilla Firefox, Safari and Internet Explorer 9 or above in order of preference. 

If you are using an iPad, then, you can access it using the Safari Browser. 

If you are using a Tablet PC or a smart phone, it is recommended to use the Android App. If you are using the App, then the tests are downloaded initially when you open the test and then you can take the test even if there is no internet connection. When you get internet connection again, the results of your test will get synced with the server and you can login at the website also to see your scores.