Hello
Cough,
sore throat and high temperature with
streptococcus as an etiological agent can be managed well with penicillin.
In some cases there may be penicillin resistance, amoxicillin clavulinic acid combination works well in this condition.
Do warm saline gargle 3-4 times a day. For controlling temperature give
paracetamol 6 hourly, also do tepid sponging.
As chest is clear it seems upper
respiratory tract infection. You can use some cough syrup to relieve cough.
Get a blood report done which will help in making diagnosis and also for assessing severity.
Regards