Most people feel nervous going to job interviews and having to give the best display of themselves in front of total strangers.

The usual comment that I would hear from clients who have previously done badly at an interview is;
 “they knew they were the best for the job but they lost the position because their nerves let them down”.

Obviously no one can expect to succeed in an interview if they haven’t prepared practically for it !
(which no one can do for them, except themselves)

While getting called to attend the interview in the first instance may be difficult enough, actually succeeding at the interview and being better than all of the other competition is the main target.