Could you help

去学校：go to school
上学：go to school
上学校：It is not a very formal usage, in oral language, it can be understood as 去学校；In written language, it is followed by other sentence structures. For example: 我不喜欢上学校的课。I don't like taking the classes of the school. In fact, 上课 is a word, but between 上and 课， a modifier is added.

去學校 will be much common usage. The other is 上學 attending class.

第一。上學和上學校是不一樣用法。上學是離合詞。例如，我上了2年的大學。上學校是上＋學校，這裡學校是名詞，後面要加和學校有關的事情。例如，我不喜歡上學校的廁所。上學校的網站。後面能接的事物一定要和上這個字配合。
第二，去學校上課，去學校做什麼，後面要加動作，去學校睡覺，去學校學唱歌。

They have the same meaning. Example: 我上学校玩。我去学校玩。Both means I go play in the school.

do not to be too nervers , there is no different betwen "上学校/ 去学校", relax,there is no trap.

I think it means the same. But most native speaker will use Ted to use number 2. It means you go to school.

上学校—— could means "to attend or enroll in a school (mostly works for students)
去学校—— "to go to school" (it can be either parent/student/teacher)

I think it should be 上学。 上学 you go to school and study as a student. 去学校 everyone can go to the place called 学校， students, teachers, parents....