keep getting tongue tied

topic for oral is competition! still ok manage to talk more BUT keep getting tongue tied =.= sian.. during the waiting for my turn i was so quiet and stone..finish my oral at 3.35pm, join them (dan wq lina) for study BUT i was very 'gong' dont know wat to do.. stare in daze for long time after a while keep chatting with them (dan wq lina) lol.. slack.. do some math tys questions only..