most sore throats are viral and viruses will not respond to antibiotics. a few sore throats are strep and amox-clav (augmentin) would not be the drug of choice. it may work assuming you are taking an appropriate dose. assuming you are an adults (i do not know your weight) but this would be a lower than optimum dose so the chance of a treatment failure would be high. it is really not wise to self-diagnose and self-treat as sore throat especially one that is more likely to be viral and not bacterial.
can i use amoclav for a sore throat? . 250mg/125mg. tabs co-amoxiclav