Wazifahs to read before interviews/exams and for safety

Assalam o alaikum,Respected Mufti Sahab
Sometimes at work or at home there are collegues , neighbours and friends who might seem friendly but are actually not and they may try to harm by some kind of trick or poisoning the boss or by doing black magic. So to be safe from all these what should be done so that one remains safe from the enemy all the time and not only at office or school but everywhere. Does one have to wear a taweez. Please suggest me from the correct Ilm light of yours.

Jazzak Allah!