Thank you sooo much! I really did need some detailed review on my writing. At least now I know where I stand.
I have spent absolutely zero time with grammar as of yet. You really seemed to have done your homework, can you please tell me a few things.

The books you used?
The strategy to improve grammar?
The time I should dedicate to grammar?

I am asking strategy because I don't really know how one goes about imbibing grammar rules. I once tried Essential Grammar in Use by Murphy (Cambridge), and I didn't really see the point of book - the more I did the exercises, the more I forgot the preceding grammar rules. I mean, it is impossible to be consciously aware of grammar rules by undertaking the exercises in such books.

I need your own opinion in this matter (The posts on this forum regarding grammar improvement are vague or lost in the labyrinth )