Understand that there is no single "magic number" when it comes to your A1C levels. However, you should aim to keep this number as low as possible in order to reduce your chances of developing complications from diabetes. Even slightly high A1C levels put you at considerable risk for stroke and cardiovascular problems.
To make sure you choose the right carbohydrates, avoid white foods. White bread, pasta, or rice are all made from refined carbohydrates, which means they are also high glycemic index foods. Getting your carbohydrates from whole wheat products will ensure that your glucose levels stay stable, and that your body is able to digest them properly.
If you've slipped up and consumed too much alcohol, be sure to avoid carbohydrates. One of the biggest reasons alcohol poses a risk to diabetes sufferers is that it is full of quickly absorbed carbohydrates. Staying away from carbohydrates will keep your blood sugar levels from spiking any further, and will help prevent your alcohol consumption from causing any additional problems.