My corrections (please check grammar...etc):

As I reflected back I realized that my friends got better grades than me.

...better grades than me... What is wrong with this?

...seek for help... What is wrong with this?

... it instead learns... What is wrong with this?

Literally, it does not learn... --> It does not learn literally...

The hare never fails which means it never learns. Yet when it fails... (Do you see the contradiction here?)
Oops!!!!!

Not only failure is...--> This is not parallel to "it allows..." , right?

key ingredient- failure A dash should be used,correct?

...deeper in to learning. What is wrong?

As I reflected back<~~"back" is repetitive; the word "reflect" means to look back, so delete "back;" also you need to add a comma after "reflected" I realized that my friends got better grades than I did. (Otherwise, you're trying to compare yourself to someone's grades! That's a comparison that will never make sense!!)

...seek for help... What is wrong with this?
Get rid of the word "for" -- it's not needed with the word "seek."

... it instead learns... What is wrong with this?
It's poor word order to stick any type of introductory word between a subject and its verb; better is this: "Instead, it learns ... "

Literally, it does not learn... --> It does not learn literally...
No ... just delete "Literally" -- that's a word that is currently used by teens and young college students far too much and usually incorrectly. Just delete it. It's not needed.

The hare never fails which means it never learns. Yet when it fails... (Do you see the contradiction here?)
Oops!!!!! =)

Not only failure is...--> This is not parallel to "it allows..." , right? Right ... and word order, too: "is" and "failure" need to be reversed.

key ingredient- failure A dash should be used,correct? correct

...deeper in to learning. What is wrong? You need the word "into" -- not spelled "in to."

Thank you very much, tutor! :)

Let's go through your corrections and address the grammar issues:

1. "As I reflected back, I realized that my friends got better grades than me."
- This sentence is grammatically correct. Good job!

2. "...seek for help..."
- The word "for" is not needed after "seek." You can simply say "seek help."

3. "...it instead learns..."
- There is nothing wrong with this sentence grammatically.

4. "Literally, it does not learn..." -> "It does not learn literally..."
- The word "literally" should be placed before the verb "does," not after.

5. "The hare never fails which means it never learns. Yet when it fails..."
- There is no grammatical error in these sentences, but there is a contradiction with the statement. The first sentence implies that the hare never learns, but the second sentence suggests that it does.

6. "Not only failure is..." -> "Not only is failure..."
- In order to make the sentence parallel to "it allows...," the word "is" should be placed before "failure."

7. "key ingredient- failure" -> "key ingredient: failure"
- A colon should be used instead of a dash to indicate a relationship between "key ingredient" and "failure."

8. "...deeper in to learning."
- The phrase should be written as "deeper into learning" without the space between "in" and "to."

Remember to always review and proofread your writing to catch any grammar or syntax mistakes.