Salam Qurban sahb, i am an aspirant for CE 2017, and from my experience i can say if you put in 6 good hours a day from now until CE 2018 you will have excellent preparation.
Covering the course itself does not take too long, and the rest of time can be used to work on your weaknesses.
Your English seems okay, but it needs some more work. For overall English improvement read Dawn Daily (this will help you in all your other subjects), as well as reading other English books that you think you might enjoy, such as crime fiction, thrillers, or fantasy.
For the Essay, write one essay a week and get it checked. Don't be disheartened if you write a terrible essay in the beginning or if you can't even write a complete essay. That is what preparation time is for, to learn to do what we can't.
For the precis paper, do two or three precis a week, memorize the barons 3500 GRE List, Memorize Idioms from Mcmordies, and practice sentence correction and direct-indirect.
Best of luck, and please do pray for my success in the upcoming attempt
