If you registered through chinesetest.cn: 
Please fill out the HSK Mock Refund Request Form and allow 4–8 weeks for processing. The refund will be returned to your original payment method. 

If you purchased on hskmock.cn or hskmock.com: 
Please email us at help@hskmock.com for assistance. 

If you purchased through the iOS App Store: 
Refunds must be requested directly via Apple's system.