You can download here Remington Gail typing software Indic Input (Version 1, 2 and 3).
After that you can add the Hindi Indic Input from the control panel.
NOTE: For Mangal font typing test in Remington Gail keyboard first, you have to install Remington Gail Typing Software (Indic Input). Note: Password of PDF file > hinditypingtest.in How to Enable Hindi Remington (Gail) Keyboard on PC Download Remington (Gail) Character Code PDF.Download Mangal Remington (Gail) Keyboard Layout PDF.
Mangal Unicode Font Typing Test Mangal Font Typing Test 1 Minute Mangal Font Typing Test 2 Minutes Mangal Font Typing Test 5 Minutes Mangal Font Typing Test 10 Minutes Resources for Mangal Font Hindi Typing