Hi Kundinger, Thanks for writing in to Healthcare Magic! Kalms, is a traditional drug remedy, it boasts of great relief in anxiety and improve performance but actually has been not tested in trials as is true of all it s traditional cousins. I would say not to trust them, it can even increase the symptoms; even then if you want to take it, I would suggest you should take it beforehand so that you do not suffer at presentation. Rather you should consult a psychiatrist, he would prescribe you the medicines proven to be of benefit and you can take them. Trying to speak and do rehearsal before a big mirror/ with friends would also help. If you have any further query please let me know I would try to answer it for you. Wish you a great health!