Elective course means that an undergraduate must choose enough credits, usually eight, during his college years, not his major; A major refers to a department where you have devoted yourself wholeheartedly for four years.

It may be a bit complicated to say that you are single-minded, because generally speaking, you have the opportunity to cross-major, that is, you can switch from a major you don't like to a major you like.

Usually at the end of the freshman year, if your grades meet the requirements of our school, you will have a chance to pass an exam and then transfer to your favorite department. So, you should study hard, or you won't have a chance to change departments.

Of course, the situation is different between schools. You should ask your guidance about changing departments after entering school.

What's more, you may fall in love with your current major one year after entering school, and some students here are like this. Besides, changing departments is complicated after all, because everyone has been in school for a year, so you may be cautious about quitting school.