We advocate the use of “Best Practices for Online Exams”. The most helpful item in these recommendations is the use of a bank of test questions. The other recommendations are also quite helpful in diminishing the impact of “cross talk”. Also you should be very careful when setting your feedback options.
We do understand your concern but we are a walk-in facility and do not reserve space for specific courses. We are not able to guarantee that students will be able to get in at a particular day or time which is why we require a minimum of three working days as a window of opportunity.