“Scandals are useful because they focus our attention on problems in ways that no speaker or reformer ever could.”

Sentence: Learning and Success never possible without mistakes.
No grammatical errors
Sentence: Human being in only eligible to make mistakes and to learn from them.
Description: The word being is not usually used as a noun, singular, common
Suggestion: Refer to being
Sentence: We never find any person who have succeed without making mistakes in his path.
No grammatical errors
Sentence: Mistakes are only which realize person that what is lacking in him and what he need to improve.
No grammatical errors
Sentence: No one can get feeling about whether he is progressing or not without looking towards the improvement made by him from his previous mistakes.
No grammatical errors
Sentence: Scandals made by human also mistake done by them and it always helps to remove the mistakes.
No grammatical errors
Sentence: We every day see in the news paper that these much people caught in this scandal and this scandal occurred here.
Description: A pronoun, personal, nominative, not 3rd person singular is not usually followed by an article
Suggestion: Refer to We and every
Description: The fragment day see in is rare
Suggestion: Possible agreement error: Replace see with verb, past participle
Sentence: Such a news and scandal disclose the reality of the world.
Description: The fragment scandal disclose the is rare
Suggestion: Possible agreement error: Replace disclose with verb, past tense
Sentence: It's too tough for single person to raise his voice and say that this thing is bad and it must be stopped.
No grammatical errors
Sentence: While the scandals come in picture can do it easily and bring attention of all.
No grammatical errors
Sentence: Person needs to be punished or disclosed if he is doing anything wrong.
No grammatical errors
Sentence: If it doesn't happen that he will keep doing the same crime.
No grammatical errors
Sentence: Once he caught in any scandal and every one give attention to him then he realize that he was doing wrong and that may help him to stop it in future.
Description: The fragment one give attention is rare
Suggestion: Possible agreement error: Replace give with verb, present tense, 3rd person singular
Description: The fragment he realize that is rare
Suggestion: Possible agreement error: Replace realize with verb, past tense
Sentence: Wikileaks comes in picture once we talk about the scandal.
No grammatical errors
Sentence: Wikileaks is website with very good working group and network which exposed the scandals from all over the worlds.
No grammatical errors
Sentence: Many big black issues which were going on keeping citizens in the darkness has been realized by them and make us look towards that.
No grammatical errors
Sentence: The job of this site has bring great attention for all who attached with such scandal and keep one from such a things.
Description: A verb 'to have', present tense, 3rd person singular is not usually followed by a verb, base: uninflected present, imperative or infinitive
Suggestion: Refer to has and bring
Sentence: It has done the job that one leader or any personality can not do.
No grammatical errors
Sentence: Many problems which are going on the backend never comes in news if it's not caught.
No grammatical errors
Sentence: Scandals coming out can only focus our attention towards it and make every one to hinder that thing again.
No grammatical errors
Sentence: Once such a scandal are caught and disclosed, laws again such a issues become possible.
No grammatical errors
Sentence: Loss occurred due that mistake can be regained only if that mistake is known.
No grammatical errors
Sentence: People enrolled in such a act can be punished after realizing the scandals.
No grammatical errors
Sentence: Which become lesson for other who may think about doing such a act are related with that.
No grammatical errors
Sentence: We can say that Scandal speak in a way and put the fact in front of all in such a way that no one can do.
Description: The fragment Scandal speak in is rare
Suggestion: Possible agreement error: Replace speak with verb, past participle
Sentence: It helps a lot in changing the scenario.
No grammatical errors
Sentence: So Scandals are useful because they focus our attention on problems in ways that no speaker or reformer ever could.
Description: The fragment useful because they is not usually preceded by are
Suggestion: Possible agreement error: Replace are with is

Sentence: Learning and Success never possible without mistakes.
No spelling errors
Sentence: Human being in only eligible to make mistakes and to learn from them.
No spelling errors
Sentence: We never find any person who have succeed without making mistakes in his path.
No spelling errors
Sentence: Mistakes are only which realize person that what is lacking in him and what he need to improve.
No spelling errors
Sentence: No one can get feeling about whether he is progressing or not without looking towards the improvement made by him from his previous mistakes.
No spelling errors
Sentence: Scandals made by human also mistake done by them and it always helps to remove the mistakes.
No spelling errors
Sentence: We every day see in the news paper that these much people caught in this scandal and this scandal occurred here.
Error: news Suggestion: No alternate word
Sentence: Such a news and scandal disclose the reality of the world.
Error: news Suggestion: No alternate word
Sentence: It's too tough for single person to raise his voice and say that this thing is bad and it must be stopped.
No spelling errors
Sentence: While the scandals come in picture can do it easily and bring attention of all.
No spelling errors
Sentence: Person needs to be punished or disclosed if he is doing anything wrong.
No spelling errors
Sentence: If it doesn't happen that he will keep doing the same crime.
Error: doesn Suggestion: does
Sentence: Once he caught in any scandal and every one give attention to him then he realize that he was doing wrong and that may help him to stop it in future.
Error: may Suggestion: No alternate word
Sentence: Wikileaks comes in picture once we talk about the scandal.
No spelling errors
Sentence: Wikileaks is website with very good working group and network which exposed the scandals from all over the worlds.
Error: website Suggestion: west
Sentence: Many big black issues which were going on keeping citizens in the darkness has been realized by them and make us look towards that.
No spelling errors
Sentence: The job of this site has bring great attention for all who attached with such scandal and keep one from such a things.
No spelling errors
Sentence: It has done the job that one leader or any personality can not do.
No spelling errors
Sentence: Many problems which are going on the backend never comes in news if it's not caught.
Error: news Suggestion: No alternate word
Error: backend Suggestion: backed
Sentence: Scandals coming out can only focus our attention towards it and make every one to hinder that thing again.
No spelling errors
Sentence: Once such a scandal are caught and disclosed, laws again such a issues become possible.
No spelling errors
Sentence: Loss occurred due that mistake can be regained only if that mistake is known.
No spelling errors
Sentence: People enrolled in such a act can be punished after realizing the scandals.
No spelling errors
Sentence: Which become lesson for other who may think about doing such a act are related with that.
Error: may Suggestion: No alternate word
Sentence: We can say that Scandal speak in a way and put the fact in front of all in such a way that no one can do.
No spelling errors
Sentence: It helps a lot in changing the scenario.
No spelling errors
Sentence: So Scandals are useful because they focus our attention on problems in ways that no speaker or reformer ever could.
No spelling errors

No. of Spelling Errors: 5
No. of Words: 457
No. of Different Words: 214
Average Word Length: 4.311
Word Length SD: 2.059
No. of Characters: 1970

Average Sentence Length: 16.926
Sentence Length SD: 5.564
Use of Passive Voice: 0
Use of Discourse Markers: 0.37
Sentence-Text Coherence: 0.269
Sentence-Para Coherence: 0.545
Sentence-Sentence Coherence: 0.158

Attribute Value Ideal
Score: 4.0 out of 6
Category: Good Excellent
No. of Grammatical Errors: 9 2
No. of Spelling Errors: 5 2
No. of Sentences: 27 15
No. of Words: 457 350
No. of Characters: 1970 1500
No. of Different Words: 214 200
Fourth Root of Number of Words: 4.624 4.7
Average Word Length: 4.311 4.6
Word Length SD: 2.059 2.4
No. of Words greater than 5 chars: 114 100
No. of Words greater than 6 chars: 86 80
No. of Words greater than 7 chars: 47 40
No. of Words greater than 8 chars: 13 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 16.926 21.0
Sentence Length SD: 5.564 7.5
Use of Discourse Markers (%): 0.37 0.12
Sentence-Text Coherence: 0.269 0.35
Sentence-Para Coherence: 0.545 0.50
Sentence-Sentence Coherence: 0.158 0.07
Number of Paragraphs: 7 5

I think there are some duplicatons in your issue.

e.g.

It’s too tough for single person to raise his voice and say that this thing is bad and it must be stopped. While the scandals come in picture can do it easily and bring attention of all.
&&&
Many problems which are going on the backend never comes in news if it’s not caught. Scandals coming out can only focus our attention towards it and make every one to hinder that thing again.

Person needs to be punished or disclosed if he is doing anything wrong. If it doesn’t happen that he will keep doing the same crime. Once he caught in any scandal and every one give attention to him then he realize that he was doing wrong and that may help him to stop it in future.
&&&
Once such a scandal are caught and disclosed, laws again such a issues become possible. Loss occurred due that mistake can be regained only if that mistake is known. People enrolled in such a act can be punished after realizing the scandals. Which become lesson for other who may think about doing such a act are related with that.