generally the instructor should be paying enough attention to her class to notice if someone is doing this- and re-direct the person being 'disruptive' there is nothing wrong with either telling the person who is asking for help that you are just learning too- she should ask the class instructor- as for the 'other one' who disrupts because she is finished ahead of everyone else- I would probably either excuse myself and have a word with the teacher- who should deal with it- or I may choose to be a bit more 'blunt' and say---i'd be done too if I was given the opportunity to work on it in peace. when I spend money on a class I do expect the instructor to start the class with some 'guidelines'-instructions that address these issues- she is there for questions- and it is not ok to keep others from their work- i'm not saying it isn't ok to work together if 2 people choose to- but it should be mutual, agreed on and ok'd ahead of time with the instructor.