Aoa my name is ahsan ali i am a little bit confused that i never went through writing quality and valuable statements.i even dont know the grammatical aspect of english but i have passion and believe and is there any live grammer teacher or web application in which i start writing and it starts pointing mistake made by me with correct tenses and spellings.
I have never been saying till date nor do I come to write....Will wait for your reply

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You can try using "Grammarly". But I believe, you will require an actual tutor or mentor.

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My opinion may be a little different than opinions of other people on this. I don't believe that one session of academy or some six months of English Prep a long with other css subjects is enough to master this language. If someone has poor English then they should do English for 6 months and then do the rest of css.
You can start with watching some basic grammar and language videos on YouTube. But most importantly, read some good novels like Harry Potter or something John Green. A lot of people suggest reading classics, but I don't because its a trap. No one uses the language the way its used in classics. In fact, I have seen people use 'thee' here on the forum, and it does not make a sense to use this word in a contemporary setting. So read some good contemporary books. Trust me, a lot of a levels students and foreign grads have bad English, the only people who have good English are the ones who read a lot of novels.
If anyone wants then I can suggest some good novels as well.

Reading novels is one of the best way to improve one's English

Kindly suggest me some good novels please.

First of all, the novels that actually improved my English were the Harry Potter series and I regret not reading this series as a kid. They fixed my English long after when I was a teenager. So first of all is Harry Potter series. Then I read Twilight, which is a terrible story and gives really bad role model to young girls, but unfortunately, its well written. These two book series helped, and I will recommend reading Harry Potter in all cases, not twilight instead there are other books that one can read.

After that essay here are some recommendations
Harry Potter Series
The Hunger Games Series
The Winners Curse Series by Marie Rutkoski (amazing political story, and it really good vocabulary)
Percy Jackson series and basically everything Rick Riodan
The Lunar Chronically (this has really good expression and vocabulary and amazing characters)
Six of Crows and Crooked Kingdom by leigh bardugo (this book series is comprised of two books only and its so amazing)
All the Bright Places by Jennifer Niven
The Martian (Amazing and out of the box concept)
The President is Missing (Its a novel co-authored by Bill Clinton)
Turtles all the way down and Paper Towns (a lot of people don't like John Green Stories, but he has a very unique expression, and its not same in the fault in our stars)
Getting over Garrett Delaney by Abby McDonnald (only contemporary book that I ever liked)
Fangirl by Rainbow Rowell (really good)
Pride and Prejudice (usually teachers won't recommend classics for CSS because students start using old English to impress the examiner, but this is a good book.)