In today's world, due toSome people use the lack of good job opportunities, some people in today's world to justify the pressure on young people to succeed academically.

The original sentence is a bit unclear. I think some rearrangement of phrases makes it clearer what the people justify this pressure with.

To begin withFirstly, non-academic subjects such as physical education can help children to learn how to relax and maintain good mental health.

"To begin with" sounds a bit awkward as a transition phrase.
"To" is unnecessary, but I think it would be grammatically correct either way.

Academic or job burnout is a problem that young people are likely to face because of the having to study or work too much, ...

"The" is unnecessary and makes the sentence wordy.
I think it connecting this to the next sentence makes both of them flow better.

That...too much, which is detrimental to their mental health, and for that reason. Therefore, learning exercise habits from school can help them to relax and deal with stress.

Learning how to cook is a good way to preducevent obesity, because home meals are more nutritious and healthier.

Unless you are implying that these kids are all already obese, prevent might be a better word choice.

In the same way, doing exercise regularly reduces the chances of suffering from heart disease due to the lack of movement.

Suffering is unnecessary

In conclusion, education should go further than the academic aspect by teaching students’ good healthy habits such as cooking and doing exerciseing regularly, ...

Good - redundant
' or possession unnecessary
To exercise - more concise
Connecting this sentence with the next one increases flow - for some reason, starting a sentence with "that" sounds awkward. I think if you really want to separate them, you should replace "that" with "this." Same for the phrase before that started with "that." Either replace w "this" or connect

That... which can also help them to deal with mental health problems due to studying too much, and diseases like obesity or heart disease.

To - unnecessary

04/07 Education: oOpinion eEssay :)

In today's world, dDue to the lack of good job opportunities today, some people justify the pressure on/pressuring young people to succeed academically.

According to this opinionFurthermore, /Moreover, non-academic subjects such as physical education and cookery should be removed from the school syllabus so that children can focus on what is important for their future.

I tend to disagree with that statement because the purpose of education is not onlymeant to find a job but toand also improve peoples’ lives beyond the economic aspectin other ways.

I would make this statement more definitive, since you're writing an opinion essay.

To begin with, nNon-academic subjects, such as physical education, can help children to learn how to relax and maintain their well-being/good mental health.

Academic or job burnout is a problem that young people are likely to face because of the having tothey may study for wmorke too muchhan 12 hours a day.

That is detrimental to their mental health, and for that reason, learning how to exercise habits properly in/from school can help them to relax and deal with stress.

Furthermore, non-academic classes teach skills that are going to be useful for children’s adult lives in orderto help school-aged children in their adult years to have a healthy lifestyle.

Learning how to cook is a goodn excellent way to reduce obesity, since/because home meals are more nutritious and healthier.

In the same way, doingMoreover, exerciseing regularly reduces the chances of suffering from heart disease due to the lack of movement/living a sedentary lifestyle.

In conclusion, education should go further than the academic aspects by teaching students’ good healthy habits such as cooking and doing exerciseing regularly.