科目 (kēmù) means "subject" or "course" in an academic context. It is used to refer to the individual subjects within a curriculum, such as 语文, 数学, and 科学. You will often see it in discussions about exams and school schedules.
这个学期我一共选了六个科目。
Zhège xuéqī wǒ yígòng xuǎn le liù ge kēmù.
I chose a total of six subjects this semester.
你觉得哪个科目最难?
Nǐ juéde nǎge kēmù zuì nán?
Which subject do you think is the hardest?
高考的科目包括语文、数学和英语。
Gāokǎo de kēmù bāokuò yǔwén, shùxué hé Yīngyǔ.
The subjects for the college entrance exam include Chinese, math, and English.