aA school activity that should be eliminated

I personally believe our school curriculum is enough professional enough.

I am satisfied with most of our school activities and classes, but if I haved to say what should be eliminated, I would say team sports.

The use of conditional perfect would be appropriate here.

However, it is unnecessary to be part of school activities, since children have different interests and talents, and it is unfair to force them choose team sports to learn cooperation.

For example, students who are too short or too slow may be kicked out of thea relay race at the beginning.

I feel that "a" is more appropriate unless you´re talking about a specific relay race.

As a result, schools should provide a wide variety of cooperating activities for students to choose from, andwhich I believe there are many other activities that canwould still teach them how to work with others.

This is purely stylistic. I personally don't like to repeat the same noun twice in a sentence if I don't have to.

If team sports are removed, I think students who are more likely to attend indoor activities will be relieved because they can choose completely up toto participate in activities of their interests.

a sA School aActivity tThat sShould be eliminatRemoved

Words in titles in English are capitalized, except for small word like a, an, or, and, be etc.

I personally believe our school curriculum is good enough professional.

Enough usually come after the adjective it's describing. Professional I'd say isn't really the word to be used here since school isn't really a professional activity. There isn't an education to become a student. Good will work just fine

I am satisfied with most of our school activities and classes, but if I haved to say wone thing that should be eliminatremoved, I would say team sports.

However, it is unnecessary for sports to be part of mandatory school activities, since children have different interests and talents, and therefore, it is unfair to force them chooseinto team sports to learn cooperation.

Mostly stylistic changes. However I've noticed you rely pretty heavily on commas for separating different parts of your sentences. Most of the time, linking words (like and or because) will be better to use because they improve the flow of your sentences. Commas have a tendency to make a sentence too long and difficult to read.

For example, sStudents who are too short or too slow may be kicked out of the relay race at the beginnings.

As a result, schools shouldSchools should instead aim to provide a wider variety of cooperating activitiesactivities that encourage cooperation for students to choose from, and. I believe there are manylots of other activities that can teach themchildren how to work with otogethers.

I don't know what you mean with "as a result". You're not really deriving a result from anything. I'd use "instead" to provide a counter-opinion to the problem you've laid out. Then, another comma that joins together two sentences that are better left apart.

I believe that if team sports awere removed, I think students who are morewould rather likely to attend indoor activities willould be relieved because they canould choose completely up to theirtheir activities solely based on their personal interests.

Some reformatting to eliminate that comma. Then you need to use subjunctive tense (would and could instead of will and can) since your talking about theoretical scenarios in an if-clause.