With treatment and a low carb diet your sugars can be much lower. Treatment won't do it on its own.

The A1C is a three month average pf your blood sugar. By controling your daily blood sugars your A1C will reflect it by being lower.

How does one bring down their HBA1C - Can this be sorted with diet and meds?

It's a day-to-day, meal-to-meal process. One that you begin and never stop. Diabetes is controllable. It takes concentration and wise choices.