Could you help me with my writing please, explaining any mistakes? Thanks in advance.

Marks Marking [1] students encourage them to learn. What is your opinion?
There is no doubt that we cannot have an objective system of measurements without numbers. That's why many people claim that marks are a good indicators [2] of knowledge and they get encourage students to learn.
As for me, I believe that if the result of a student's [3] work is assessed at its true value , it promotes his interest his interest and desire to do the following tasks with much greater diligence. Moreover, evaluation helps to find strengths and weaknesses in a student's knowledge, and motivates the student to working better harder. Finally, marks play an important role at toward the certificate of graduation or, in other words, in diplomas, which has a significant impact on the following years. It forces and stimulates students to take care of their studies.
However, some people think that students understand that they can get a good mark without any particular efforts in learning the material, by using a minimum of information or with a the help of devices [4] only.
I cannot agree with this opinion as such cases are quite rare and real grades can only be obtained by means of a student's knowledge only.
To conclude, I want to say that marks give make students the stress stressed but at the same time they make them study hard to achieve success [5].

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[1] The word 'marks' is a noun.  For example:

-- "The teacher gave extra marks for neat handwriting."

The word 'marking' is a verb.  For example:

-- "The teacher was marking the students' essays."

[2] The article 'a' is used when referring to one thing.

-- "Many people claim that marks are a good indicator."  ('Indicator' is singlular.)

[3] In English, if you refer to a singular noun, you need to use either 'a' or 'the'.  Use 'a' when referring to the thing in general.  As examples:

-- "I want to buy a car."  (We have not specified which car.)

-- "I have a dog."  (We have not specified which dog.)

Use 'the' when referring to one specific thing.  As examples:

-- "I want to buy the car that my neighbor is selling."  (We have specified which car.)

-- "I have the dog which followed me home from the park."  (We have specified which dog.)

[4] The word 'devices' has a very broad meaning, and I don't know what devices you mean here.  Therefore, the type of devices should be specified.  For example:

-- "The students might use electronic devices."

[5] The word 'success' is a noun.  The word 'succeed' is a verb.  As examples:

-- "I have achieved success."

-- "I want to succeed."

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Great job, smelval.  This is your best writing so far.  While I enjoy reading your letters, I am pleased to see you write something different.