The resources provided by other members here are really good. I guess it depends on what knowledge/experience you already have with AD.
For me I started with the MS Press R2 book for 70-640 and a virtual box lab. I then worked through all the chapters in the book and made notes as I went along. Technet is essential as the book does not cover everything. Keep on at lab work until you're sure you know it.
I used Kaplan for tests once I felt ready enough for the exam, which I didn't get first time but did second time round.
Comments
For me I started with the MS Press R2 book for 70-640 and a virtual box lab. I then worked through all the chapters in the book and made notes as I went along. Technet is essential as the book does not cover everything. Keep on at lab work until you're sure you know it.
I used Kaplan for tests once I felt ready enough for the exam, which I didn't get first time but did second time round.