Which edition of books i should purchase

sumit pitty (bikaner) (65 Points)

14 May 2016  
FOR CA FINAL NOV.16 WHICH EDITION OR WHICH ASSESSMENT YEAR BOOK I SHOULD PURCHASE FOR. BANGUR IDT. VINOD GUPTA DT. ISCA VALECHA BOOK. I SHOULD PURCHASE BOOK IMMEDIATELY OR WAIT FOR 15 DAYS IN HOPE OF NEW EDITION.