@ noor wher can i purchase (to the point book) in karachi i couldnt find that book so can u tell me ....

hi noor,i have the same problem as urs,but the good thing about u is that though u make blunders but even then u try to speak and write in english
this is a good sign,,u will improve ur skill like this way

I need to know that which book is best, i have review the book of wren & martin but still facing problem so please help me how can i improve my english,

Wren n Martin is very comprehensive but it is a bit scary if one looks at it for the first time. I think you should better go for Oxford Practice Grammar by John Eastwood. It is very easy to understand, having almost all the things you need to know about practical grammar, as well as having exercises with every chapter to assess yourself. Answers of exercises are also given in the end. I am pretty sure it will solve your problem.
Regards

__________________
Whatever is important will remain; whatever is useless will disappear.

grammer is very important but i don't think that one needs to work so hard for it. Unlike many students in Pakistan, we (appearing in O'LeveLs with English A as a subject) did not need to study grammer. So practically all my life i have never learnt grammer.

One can improve his english writing skills if you are able to think clearly in English. Try to develop that. Try to develop the flow and the continuity. When i try to attempt anything related to grammer, i try to recall/use that sentence in my thoughts. if it sounds correct to me its okay, else i think about the alternatives. This can be developed if you watch english movies, listen to people having conversations in english and above all trying to develop the all times essential english knowledge and vocabulary through the reading habit.

P.S treat it as a personal opinion! People are more than free to differ!

I followed that and i needed one hour study for precise paper....for those direct/indirects etc etc...they are simple if you know the rules and all ...so people don't need to buy big books for them. instead try to indulge into some quality novels and short stories etc.

__________________
Umar Abbas Babar
I Know I am Bad But When Bad is the Best, Bad is the Only Choice

Although I do not hail from O level schooling system, yet it is applicable to me too.

__________________
Verily, His command, when He intends a thing, is only that He says "Be!" - and it is! (Al-Quran)

u r exactly, even though i m not an o/a level student, but i studied at Beaconhouse till 8th class, and do exactly the way you are telling, and this way can be achieved through reading.

suggest me book for preposition