这段文章有一些语法错误和拼写问题，下面是详细的分析和修改建议：

"Now days" -> "Nowadays"

这是一个常见的拼写错误，应该写成“Nowadays”表示“如今”或“现在”。
"more and more college students use to mobile phone" -> "more and more college students use mobile phones"

“use to”是不正确的搭配，正确的表达应该是“use”。此外，"mobile phone" 应该用复数形式“mobile phones”。
"we are have a surveied consequence as college student use to mobile phone" -> "we have surveyed the consequences of college students' use of mobile phones"

“are have”不符合语法，应该改为“have”。“surveied”是拼写错误，正确的应该是“surveyed”。同时，“consequence”应改为复数“consequences”，并且“college student”要改为“college students'”，表示所有大学生的使用情况。
"Have 21% college students play games on mobile phone" -> "21% of college students play games on mobile phones"

主语“Have”用错了，应该是“21% of”。此外，"mobile phone"应改为复数形式“mobile phones”。
"They think play games could help themselves relax" -> "They think playing games could help them relax"

“play games”应该用动名词形式“playing”，且“help themselves relax”应改为“help them relax”，因为这里指的是他们自己。
"anther have 33% college students glance over social video" -> "Another 33% of college students glance at social videos"

“anther”是拼写错误，应该改为“another”。同时，"glance over"应改为“glance at”，并且“social video”应改为复数形式“social videos”。
"They are think that can relax too ,and also could help they konws besides school things." -> "They think that it can help them relax too, and also help them know things beyond school."

“They are think”应该改为“they think”。
“can relax too”应该加上主语“it”，并且“help they konws”应该改为“help them know”，同时“konws”是拼写错误，应该是“know”。
“besides school things”应改为“beyond school”，更自然的表达。
"Some student learn knowledge on mobile phone have 18%" -> "18% of students learn knowledge on mobile phones"

“Some student”应该改为“some students”或“18% of students”。
"learn knowledge on mobile phone"应该改为“learn knowledge on mobile phones”。
"Besides,have 15% student listen to music with study." -> "Besides, 15% of students listen to music while studying."

“have”应改为“15% of”。“student”应改为“students”。“with study”应该改为“while studying”来表达“在学习时听音乐”。
"they says music and mobile phone could improve them learning efficiency" -> "they say music and mobile phones could improve their learning efficiency"

“says”应改为“say”，因为主语是复数“they”。“them”应改为“their”，因为指的是他们的学习效率。
"have 8% students go shopping on phone" -> "8% of students go shopping on their phones"

“have”应改为“8% of”，并且“on phone”应改为“on their phones”来表达“在手机上购物”。
"and 15% students do elsethings" -> "and 15% of students do other things"

“do elsethings”是拼写错误，应该改为“do other things”。
"In all,Use of mobile bring convenience to college student,We could encourage moer student use of mobile phone to study and amusement." -> "In all, the use of mobile phones brings convenience to college students. We could encourage more students to use mobile phones for studying and amusement."

“Use of mobile”应该改为“the use of mobile phones”。“bring”应改为“brings”。
“college student”应改为“college students”，指的是学生群体。
“moer”是拼写错误，应该是“more”。
“use of mobile phone to study and amusement”应改为“use mobile phones for studying and amusement”，更加简洁流畅。
修改后的版本：
Nowadays, more and more college students use mobile phones in their daily lives. To investigate this situation, we have surveyed the consequences of college students' use of mobile phones.

21% of college students play games on mobile phones. They think playing games could help them relax. Another 33% of college students glance at social videos. They think this can help them relax too and also help them know things beyond school. 18% of students learn knowledge on mobile phones. Besides, 15% of students listen to music while studying. They say music and mobile phones could improve their learning efficiency. 8% of students go shopping on their phones, and 15% of students do other things.

In all, the use of mobile phones brings convenience to college students. We could encourage more students to use mobile phones for studying and amusement.

这样修改后的文章语法更加准确，表达也更加清晰自然。