Black Book v The Ultimate Guide to SAT Grammar(Only for Writing Section)

I have already the critical reading part from the black book and now i want suggestions on what should i choose between this two books.Please help me out.

Do both.

 Please Go with The The Ultimate Guide to SAT Grammar by Erica Meltzer.  The author of this book does miracles for some people.  Meltzer accurately explains every grammatical concept tested by SAT based not only from the Blue Book, but also from past SAT tests.  However, with the myriad of information contained in this book, comes the demand of the test taker to put in their equal share of effort.  Without effort, there is no way to make sure the concepts are grounded in your brain.  In my opinion, the biggest flaw that students commit for SAT preparation is: ignorance for practice.  That theory cannot be further stressed when preparing for SAT.  Especially in the Writing section, the type of questions are repeated almost endlessly.  With practice, one can easily pick out exactly what each and every question is testing.

 Now back to the actual book.  If you have a significant amount of time before your SAT test date, then try to go through each grammar concept, regardless of whether you already know it or not, because you might find a rule that you were previously unaware of.  If you are under certain time constraints, try to weed out the topics that you are positive of having already mastered.  That will make the best use of the book in that situation.  
 Also, do not forget to go over the "MISCELLANEOUS" section of the book because it provides valuable information that could be overlooked or over-speculated.  Another valuable feature in this book, is an entire section dedicated to labeling the skill tested for each Writing question of the Blue Book.  
 From a personal perspective, this book literally saved my SAT writing Score.  English is not my first language and it raised my score almost 300 points in the writing section alone.  I currently score between 760-800 in the Writing section of the SAT.

Just remember to PRACTICE, PRACTICE, PRACTICE!!!

Thank you for your suggestion @littlemonster39 .Its very clear for me now.With your advice i will do the writing section from the Ultimate guide to sat grammar and reading from Black book. :wink: