And by the way, the influence
isn't always innocent or well-meant. A friend or significant-other who
has already aced the exam in question may think that s/he is being supportive.
But kidding or dismissive comments made at your expense may actually be
coming from an unconscious rivalry, and may be eating away at your confidence
like termites eating away at the floorboards.
You are the Best
No one's performance was ever damaged by people's saying "You're the best!" day after day. But plenty of opportunities for success were foiled by people's negativity.
If so, politely but firmly inform friend, family, and
foe alike that you need to marshal all your concentration on getting ready
for test day. Ask them to help you get your mind off the test whenever
possible. Otherwise, they should be enthusiastic and positive, without
exception.