Here is some information on Mayo Clinic guidelines for A1C results,

"Results
A1C test results are reported as a percentage. A higher A1C percentage corresponds to higher average blood sugar levels. The higher your A1C level, the higher your risk of developing diabetes or complications of diabetes.

For someone who doesn't have diabetes, a normal A1C level is below 5.7 percent. If your A1C level is between 5.7 and 6.4 percent, you have prediabetes (also called impaired fasting glucose), which means you have a high risk of developing diabetes in the future.

An A1C level of 6.5 percent or higher on two separate occasions shows that you have diabetes. An A1C level above 8 percent means that your diabetes is not well-controlled and you have a higher risk of developing complications of diabetes.

For most adults who have diabetes, an A1C level of 7 percent or less is a common treatment target. Lower or higher targets may be appropriate for some individuals. If your A1C level is above your target, your doctor may recommend a change in your diabetes treatment plan."

If you would like to read the entire article, here is the link, https://www.mayoclinic.org/tests-procedures/a1c-test/about/pac-20384643