High-School/College system implemented in Germany post WW2

Allegedly the Allies the Americans) wanted to implement such a system suspending the old educational system originated from Leipniz reforms in the early 19th Century. They didn´t trust the old education system of Germany Instead of a tripartite school system (with the Gymnasium as the elite schoolform with the Abitur after grade 13 , which is required to study at universities and University diplomas (instead of Bachelor and Master degrees). How would that change Post-War West Germany ?
 
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