my guarantee on this web

first of all, Let me start with this, even if you read the book provided by Microsoft page by page you need more question and answer to practice!!!
Second, when, I test myself here for several times and understand all my mistake, then only I was able to correct those. 
I recommended to practice here and it's my guarantee you will pass. I got 80% on my exam score,  questions were hard !!

thomashenderson