I have come to like the Application Developer paid mock tests online. I say this because this was not the case earlier. I did not get success for a long time and i was irritated. The problem i realized was the lack of practice. I was not regular. I used to practice at my own will - sometimes only once a week. My parents reprimanded me for this and only then i took the CAD certification exam on a serious note. And started preparing on the mocks regularly and realized that these are very user-friendly.