Giving DOP-C01 certification exam was an experience in itself. In fact, the AWS DevOps Engineer Professional mock tests. They opened up my mind and made me realize the things that i was lacking in the practice. Each question had a purpose and i realized it much later during revision. The features in the mock test are good. I especially liked the unlimited attempts feature. I could give as many as attempts i was willing to. This reinforced the learnings in many ways. I scored good and I am very very thankful to the mock tests.