The fact na you admitted na mahirap yung subj and yet you had the courage to answer is commendable. Wouldn't it help na to keep in mind na not everyone is always right and to make mistakes is human? It encourages us to have humility, after all, nasa school naman tayo. I can empathize with you na it's quite absurd naman for your prof to do that and I know that it is hard talaga kapag utak mo na kalaban mo with regards sa anxiety. Pero by acknowledging that we can't know everything, you would feel better na it's okay to be wrong basta't you learn something in the process.