It depends on the type of scar..For detailed information do direct online consultation by sending photos

Response depends on  texture and severity of  atrophy which can be mild, moderate-to-severe atrophic acne scars, ablative fractional carbon dioxide(CO2) laser resurfacing treatment once a month can be done... But Co2 laser is safe and effective for facial atrophic acne scarring. Improvement in scarring is noted in the majority of patients with minimal discomfort and minimal downtime. To say the % response you might get with Co2 lasers  We need photograph of you scar, so consult  online on practo for better suggestion and treatment.