I got Ankur’s GMAT Sentence Correct Notes which seems to me a pure Gold Masterpiece for all GMAT Students. This 133 page of detail CR note will give you every bit of knowledge to overcome CR questions in Gmat. It is very popular among Indians and I believe this well written guide will equally helpful for others. You may print out this guide and read regularly.
You mean SC not CR, right? .... or do you have notes on CR, too?