Fist Day of School is an, achievement/Trophy in Call of Duty: Modern Warfare 2, it is worth 25G, it requiers you to complete 'S.S.D.D' and 'Team Player' on Veteran Difficulty
These are the first two missions of the game. Not really hard, but you have to keep in mind that once your Humvee is down, you need to get into a building to your right. Take the school slowly and do NOT try to knife the guys with RPDs that appear to not know you're there. If you get too close to them, they will turn around and kill you immediately.