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INCOME TAXES - Reconciles the PRC statutory rates to the Company's effective tax rate (Details)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
INCOME TAXES      
PRC Income tax statutory rate (25.00%) (25.00%) (25.00%)
Effect of tax holiday and preferential tax rate 1.00%    
Non-deductible foreign losses 4.80% 18.50% 33.00%
Change in valuation allowance 21.10% 9.10%  
Non-deductible expenses and others (0.30%) (1.50%) 3.80%
Effective tax rate 1.60% 1.10% 11.80%