Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: Just found out tonight my son will not be doing practical work counting towards his GCSE exam. OK then! I thought STEM was all the rage??
This tweet contains emotions: 
anger, pessimism