Learn from mistake

The best way to learn something :

1. Try your best to do it first [although you don't know]

2. If the answer wrong, learn from it and don't repeat it again! 

3. If the answer is correct, feel GOOD...=D and keep it on!

Start this way of study since year 1, and I gonna continue to do this.

Learn from mistake is better than you do nothing at all.