> yes i always have balanced meal. i usually eat at college cafeteria. cafeteria always provide balanced meal but sometimes i eat out

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Correction:     Student's sentence        Corrected sentence        Grammar explanation       Better sentence    

yes i always have balanced meal.

Yes, I always have a balanced meal.

Remember that the first letter of the first word of your sentence must be in capital letter. Insert the article "a".

i usually eat at college cafeteria.

I usually eat at our college cafeteria.

If the pronoun is "I", it should always be in capital letter. Also, put the pronoun "our" to indicate whose cafeteria you are eating at.

cafeteria always provide balanced meal but sometimes i eat out

The cafeteria always provides balanced meals, but sometimes I eat out.

It should be meals since you are talking about a meal in general.

Always capitalize the first letter of the first word of your sentence. Use the article "the" for a noun that was previously mentioned. 

The cafeteria always provides a balanced meal, but I sometimes eat out.