Some further details needed for accurate answer like age underlying other co morbidity ?? On other medications??
HbA1c 6.6% falls in the
diabetes range (≥ 6.5%), while fasting 103 mg/dL is in prediabetes range and 2-hour value 160 mg/dL is impaired glucose tolerance.
Start with strict life style modification (diet + minimum 150 min/week exercise)
Weight reduction if overweight
Monitor fasting and post-meal sugars
If he is overweight / has strong family history / sugars persist above target, Metformin can be considered early, as it is safe and helps delay progression.
Regular follow-up is important.detail history important.
Next Steps
can recheck your reports in a standard laboratory