Challenging questions make me work hard

The questions asked in the NSE 5 - FAZ 7.0 mock tests based on the syllabus of the certification exam are very challenging. Even the sample test that I attempted could not be cleared by me. They say that the sample test is the most basic. This shook me up and hence, I instantly became a premium member and got on to the practice. Every day whatever I learnt, I wrote on a paper and used this paper just a day before the exam. That piece of paper became my mantra for many other exams as well.