Could i have ADD? help plz?

I have always had trouble like focusing in school i tend to like dose of into a dream world and just staring at the clock and miss the whole lesson.....so today i was bored and my friend offered me a adderal it was 25mg, so i took it at lunch then in 5th hour i found myself focusing on the teacher really good borderline obsessive and i got all my work done and in 6th it was starting to were off but we were reading a book out load usually i day dream the whole hour when we do that but today i was really listening and getting into the story and i was answering questions the teacher even told me i did good today. I am wondering if this could mean i have add because when my friends take it they start counting **** and being crazy but i just mellow out. So i guess i am wondering if me being calm and easier to focus is just the aderal frying my normal brain to the point i dont think as much or is it calming me down aand helping me. also i have around C average occasional D but i kinda do my hw last minuet i meen people tell me all the time if i tried i would get A's but i do try and i get C's.