On Duolingo, you would be required the correct English words. For this skill, you should have good vocabulary and spelling skills. Pacans Preparation Center is the only preparation center in Lahore for the preparation of Duolingo. Pacans is only charging Rs 7000 for the preparation of the exam. Call 0300-4094094 or 0336-5095095. Pacans is operating in Lahore and Islamabad currently.