Hello,
Welcome to Microsoft Q&A!
There's an app and an API for Take a Test. The API requires the use of the restricted capability secureAssemsment when we try to use it. The API is supported from UWP apps and makes use of the security namespace of the JavaScript API to do so. There are samples of using the API methods in that document.
Since that's a JavaScript API, they'd have to call it from somewhere that can invoke JavaScript. So it could be in a WebView or directly from a UWP app made with JavaScript. In addition, if you primarily develop in C#, you can create WinRT components for most things and use the WinRT component(s) from the JavaScript application.
Thanks.