In most exams, this may be one of the subject area tested in the chosen exam. However, there are some exams that the course may refer to the exam unit in under a general category.
An example is the category for Cisco exams under which you will now get actual exams.
Another mode is the Exam Hall. In this mode, you enter the exam hall after selecting the exam and test area. A full set of exam questions will be presented to you. However, unlike in the Practice Ground, questions come to you one at a time but you will now see the results of your choices until the total set of exams are exhausted.
The number of questions in one set is usually set by you in your exam settings. The default number is 20 questions per set. A set is over when you exhaust the total number questions or the allotted time. After that the summary of your performance is presented to you. You can then proceed to view the detailed explanations of the choices you made, memory hints, and the suggested areas of weakness.
To refill your accounts, you may have to purchase Acads(as Acadar Credits are called) from Acadar Credit Department or from accredited resellers. Acads are only available in Prepaid denominations which you can procure through direct bank deposits, wire transfers, or credit cards.
The full options are available on the Credit Section of the website which you will see once you are logged.
One Acad is about 1.6 cents(US) though the exchange rate may be change without prejudice to this quotation. The current exchange rates are always displayed on the Acads Dashboard. The number of Acads deductible per question may vary from exam to exam.