Ca final law. please guide

Hello! My exams are in Nov 15. Here in my city booksellers are saying that Munish bhandari's books For Nov 15 will come very late. They are selling May 15 edition. So please tell me what to do? Are there any major changes in Law since May 15 attempt to Nov 15 attempt? Should I wait for Nov 15 edition or buy this may 15 edition book. Thank You!