so im not a pro geographer , just a fellow geography student but standard of living is to do with the opportunities available to a person , for example wealth comfort and material goods stuff like that so when explaining that use factors like mentioned above as examples e.g so in the uk standard of living is high bc high employment rate so wealthier economy so more money to invest into public services such as NHS etc etc link your ideas
the quality of life is more to do with an individuals lifestyle, so factors such as conditions in the workplace healthcare, education human rights etc
so you could talk about an LIC country and say how the quality of life is poorer because there is a high rate of child employment , poor working conditions
only a small amount of the population have access to healthcare stuff like that , sorry im not the best explainer but I hope that kinda helps