National Test Abhyas App is an android app which is available on the Google Play Store and it cannot be run on windows without installing any emulator.
To download this app on Windows or Mac PC/Laptop, firstly you are required to download an emulator on your PC/Laptop. In that emulator, you will be able to run any android app including National Test Abhyas App. Some popularly known Android emulators are Nox Player, Bluestacks etc.
I hope this information helps you.
For further doubts feel free to ask in comment section.