Choose a subject that students study in school but you think is not important. Explain why you feel

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I think math is not important to students.

>> I think, Math is not important to students.

There are two reasons why.

>> Correct.
The first reason is that I do not remember the most of complicated mathmadical fomula.

>> The first reason is that I do not remember most of the complicated mathematical formulas we studied.

This is because I have not used them after graduating high school.

>> This is because I have not used them after graduating from high school.
The second reason is that it is a waste of time.

>> Correct.

Personally, I really liked to study math, so I could get high score.

>> Personally, I really liked to study math, so I could get high scores. 

However, I actually did not need to study it for applying to physical university, and I felt math is not important to all of students.

>> However, I actually did not need to study it to apply in university, so I felt math is not important to all students. 
As a result, I believe math is not crucial for students for these reasons.

>> As a result, I believe math is not a crucial subject for students for these reasons.