Could you please tell me what is different between Cisco 640-507 and 640-607 because I studied for 640-507 and I want know is it enough or I should study more.
The differences between 640-507 and 640-607 are varied enough that you probably will want to study more to prepare for 640-607 than you did for 507. The biggest difference is that 607 uses a simulator and actually makes you run IOS commands and interact with 2600 class routers to answer questions on the Exam. If you check out the September issue of "Certification Magazine" when it releases in mid-August, it will include a study guide I worked on that offers decent coverage of the 640-607 exam. If you can't wait that long, I recommend the various Cisco Press books for the 640-607 exam highly. They've even put together a boxed set of books called the "Cisco CCNA 640-607 Preparation Library" (ISBN: 1-58705-038-2) that lists for $120 that's well worth obtaining to help you prepare for the exam.
Also, be sure to sign up for one of the online router simulation services for Cisco exams you can find online.
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