Hi Nitin,
What you really need is a professional English tutor who has previous wide experience in running English courses.
I`m a sustainable English trainer, licensed from World Wide Learning, Oxford University, and American Consultant. I have the first class in (PCELT), which is the " Professional Certificate in English Language Teaching".
I`ve run several courses based on my own material and I`m sure I can make you grammar native.
Contact me.