What grade should you be in if you born in 1998?

Generally, if you were born between January and August of 1996, you should be going into 12th grade this fall. If you were born between September and December of 1996, you'd probably be starting 11th grade, since you probably missed the cutoff to start school. In MOST states the cutoff is around September 1st, but it does vary. Some states have later cutoffs, so it would really depend on what state you live in.