Why did Lola fail her lesson?

Answer:

Because of Dhani’s attitude and behavior
Discussion:
His attitude, arrogance, selfishness, and all he did were only to take advantage of Lola for his own pleasure; causing Lola decide to stay away from Dhani, and then Ari began falling in love with her. And when she left 
Dhani, he began to miss her and realized that he really loved her. 
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