In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Of course not, most coupons may be used only by you when you received them directly from Helmm. As the Helmm coupon includes your User ID, it cannot be resold or transferred in any way.

Yes. Coupons for each Discount Event of Helmm will be collected here while being updated day by day. Sometimes, there will be deals not updated promptly but it's rare, we expect sympathy from you. 

At the time of updating, Helmm has not applied Student Discount all year round yet. Check the official store and reach out to the customer support team to be clear.