Hit me baby one more time

It is good to recollect about your previous failure, before attempting for one more time. It has been more than one year since i wrote GMAT and failed miserably in it. Scores read 640 50 27. It's no brainer where i failed. Having scored in the likes of 750 770 in practice tests, how did i fail in the main exam? Usually the trend is otherwise. People score lesser in practice tests than in the actual exam. This could mean only one thing. I have been cheating myself in practice tests.
Its hard to believe you cheat yourself when no one is looking at you and the practice tests were only for you see where you stand. But still there could be a slight possibility that i could have fed my ego and tried to avoid the truth and fooled myself that everything is on course.
Next thing to keep in mind is obviously my failure in english section. The low score could have been due to 2 reasons.
1. I was bad at solving those questions.
2. I ran out of patience after 2 hours when i finally arrived to that section.
Now that i had finally decided to start my preparation, I have to be wary of these two points. How can i rectify my mistakes?
1. Practice hard. Probably i could ask help from my friend. Probably ask him to prepare along side. (This is too much of an ask but lets see!)
2. This is difficult to achieve given the current life style. I am going to challenge myself with non-fiction books to cultivate patience. Avoid multi-tasking during office hours.
GPAI attack!!!!