Ambow Education Holding Ltd. American Depository Shares (each representing twenty (20) revenue for the last year amounted to 83.87 M USD, the most of which — 9.16 M USD — came from its highest performing source at the moment, College Preparation & Career Enhancement Programs, the year earlier bringing 15.20 M USD. The greatest contribution to the revenue figure was made by United States — last year it brought Ambow Education Holding Ltd. American Depository Shares (each representing twenty (20) 9.16 M USD, and the year before that — 15.20 M USD.