Please remember that you are on a training day, you are not there to have a set of nails done. Many students surprise themselves how well they do at their first attempt. Many have commented that their nails are better than they have had in a salon. Yes, the occasional nails might not be perfect, but it is advisable to be patient with your colleague, as everyone is there to learn.
It would not be professional to make your colleague feel awkward if you feel you are better than them at first or have had a go at nails before. All training courses whether college or other private schools and courses, there will be different levels of learners, where many make mistakes, that is what a training course is about. Please be assured that all training is closely supervised, ensuring that the nails are done correctly. But, if your colleague is filing to hard, please let us know so we can help and advise.
