大三再定,所以大一大二也要稍微认真点 不然GPA不够很有可能进不了至于第二各问题,理论上是,ADVISOR会给你先挑好 但是你可以自己随意改
大三再定专业, In US, it is very easy to change your major. You can switch to others as long as you fulfill their requirements. You can choose double majors if you like