Writing an essay, introduction / Writing the introduction to an essay

I am preparing for the/an IELTS exam. Now/Currently I am (I'm) practicing writing and firstly trying to write good introduction.

Subject : Advantages and disadvantages of working or travelling between finishing high school and starting university.

Alternatively: Advantages and disadvantages of working or travelling during a gap year / of taking a gap year.

This is my introduction for the essay:

Students before attending courses at university need to be much more experienced than in school period;, because they are supposed to be (need to be/are required to be) more creative and accept more responsibilities. So Due to this, most they are mostly persuaded to work or travel between secondary school and college. While youth they, with no doubt, could, without a doubt, learn much/a lot at (through) work or on a trip abroad, there are also some disadvantages may to be considered too.

Please correct the any mistakes.
Any suggestions and or improvements to gain more marks would be are appreciated.

Thank you in advance.