You will get one chance to give the exam. This is done for a fair evaluation. You will have two hours to answer the questions. There are a total of 30 questions and every question is a single option correct. After you finish the quiz you will be shown the number of correct answers you have made and also you will get to know how others performed on the same test. Click on submit your score to the leaderboard to compare yourself to others. If you click on view questions on the result page, then you will get to know the correct answer keys and the solutions to all the problems. If you want to view them later then go to your account page and click on the statistics option for the respective quiz and you will be able to check your answers and the solutions.