IELTS Essays About Education discussion

There has been a dramatic growth in the number of people studying at universities in the last few decades. While some people see this as a positive trend which raises the general level of education within the community, others fear that it is lowering the quality of education.
What are the advantages and disadvantages of the increase in student numbers at university?

In some countries girls and boys are educated separately rather than mixed together in the same school.
What are the advantages and disadvantages of this?

These days many students take a gap year before going to university in order to do voluntary work abroad in underdeveloped countries.
What are the advantages and disadvantages for young people of doing volunteer work?