If I think I have ADD, should I get diagnosed?

I think I might have ADD, but my mom says there is no absolute way and Im just a little zoned out sometimes. But she mainly says that because I am super smart at school and she says if I had ADD I could be like that. I asked a question here already and I got the answer that Yes, you can get straight As and have ADD or ADHD. But I dont want to get medicated or anything, but maybe I could use a special priviledge refuarding tests. I take a longer time during tests, and I would like just an extra few minutes because I know the material, I just take a longer time to answer. So should I?