In some countries, teenagers have jobs while they are still students. Do you think this is a good id

Some countries, especially in South Korea, University students sometimes are engaging in part-time jobs. I think it is not a bad idea because they are adult. They have self-determination and their own thought to make a decision.
>> Correct
But when it comes to teenagers, it will be different matters.

>> But when it comes to teenagers, it will be a different matter.

You know, teenagers are not completely grown up and they are still immature.

>> Correct

or

>>> Teenagers are not adults yet and they are still immature.

Their brain is not enough to judge whether something is reasonable.

>> Their brain is not enough to judge whether something is reasonable or not.

So they have to achieve knowledge in school even though it is not going deep.

>> So they have to acquire knowledge in school.  (I\'m not sure on what you want mean by \"it is not going deep\'.)

And teenage years is very important because they learn attitudes suitable in society. They do not have time to spend outside.
>> Correct
 In some miserable countries, teenagers work in c or workplace.

>> In some miserable countries, teenagers work in agricultural field or do manual labor.

It is allowed under the name of tradition. I think it\'s kind of wasting in the long run. They need a chance to develop themselves.

>> Correct

They are potential advanced human resources! They should not work.
>> Correct
Glenda, your feedback is brilliant. I will concentrate on tenses. Thx!:)