So, this was started with I failed in the Salesforce CRT-600 certification and I started looking for more accurate learning sources. I found this on the net and I feel this was the best thing that happens to me in the last few months.
The web has all the required questions, with accurate answers and the most amazing feature is the result book, I know how am I doing day after day and I know where should I focus more.
I would recommend this to all taking the Salesforce exam.