From the day your clinical training classes start you must start preparing for the test, follow a step by step procedure and you will succeed in the exam. Organize your study habits from the beginning and follow it till the exams and you will pass the clinical test as well as the theory paper. If you are organized you will have all the required material and abilities necessary to get certification, so you will not be stressed. On the other hand if you do not study enough and cram in a few days for studying and practicing the craft you will be under pressure at the time of exam. So decide for yourself and prepare from the start.