Windows Typing Speed Tutor

I’m building a dedicated typing-trainer for adults whose main objective is to boost raw words-per-minute, not to learn the keyboard from scratch. The software must run natively on Windows, work offline, and feel lightweight so an office laptop can launch it in seconds... (Budget: ₹100 - ₹400 INR, Jobs: Desktop Application, Programming, Software Development, SQL, User Interface / IA, Windows Desktop)