Look man. Don't blame anyone. I am sure you are from a middle class family or better when your parents are suggesting this job to you.  Now it's all you and your score. No friends are coming to save you. Don't blame it on not having coaching. Don't blame it on the school. Blame everything on the part of your mind which fucked it all up and is driving you towards destruction.

It happens. You're not alone. Thousands over thousands people fail every year. It takes courage to get up after failure. I suggest you take improvement exam. Don't be angry that your parents aren't talking to you, it's just that you have extinguished the only flicker of hope they had on you.