Online Medical Classes - What if I work as a medical biller and don't remember some of the terms I studied?

What if I work as a medical biller and don't remember some of the terms I studied?

Will i get fired then? Do I really need to memorize ALL the medical terminology terms? If not will i be fired?

In the real world ... all the tests are OPEN BOOK! Give me a break! If you are that easily freaked, what are you doing in the workforce?
Strive to memorize all of them. When you are actually on the job, have your reference book at hand so you can look up anything you are unsure of. The only way to have true job security is to be the best at it.
~~No, as every medical office is going to use different codes and terminology due to their specialty. There is always a CPT code book as well as DX codes available for whatever you may need to check on to bill.~~