Studen discount prices for G-train from Beijing to Guangzhou

Hi, is there any kind of student discount or early booking rate for the high speed trains? In my case I'm intending to go from Beijing to Guangzhou on G79 in April, but I would like to book this trip early in advance. Prefered travel class would be First class, but that actually depends on the final rate. How to get the discounted rate?
Many thanks, Oliver