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NET REVENUES (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tuition fee ¥ 1,545,680 ¥ 1,174,596 ¥ 835,275
Certification service fee 35,980 27,466 18,038
Loan referral service fee 8,750
Others 1,875 1,136 2,873
Business taxes and surcharges (12,681) (25,190) (19,245)
Total net revenues ¥ 1,579,604 ¥ 1,178,008 ¥ 836,941