to be honest at your age you are a blank canvas for working, key attributes, be punctual for the interview, know who you are asking for, give yourself extra time for travelling for unseen circumstances employers recruiting younger people want enthusiastic people with a willingness to learn, you should be a sponge absorb everything around you. you will be developing basic employee skills you use in the future ie, knowing what is expected of you, what things like heath and saftey in the workplace, personal protective equipment, clocking in and out, understanding playslips, tax national insurance, tell employers you wish to use the experience to cement this for your future. don't approach employers saying you will be amazing and have lots of experience, you may come across as a know it all. employers won't believe you. As i said reinforce what employment will help you achieve not what the employer will gain other than what is already expected of you. remember listen carefully to questions, think about answers, if you don't need to say it then don't. be clear and concise. Same goes when taking orders from employers in a role, remember it is their job to get you to do yours, bosses don't like back chat, they don't care for opinions on how you think things should be done, especially if its coming from a young employee.