Going to university is not always the best option after leaving school. For many young people, the alternative of going to vocational school to learn a trade makes great sense. Try this exercise from the Spotlight Online archives.
Are your apostrophes in the right place? Is it "the children's shoes" or "the childrens' shoes"? Are the shoes theirs or their's or theirs'? Test yourself in ten questions to review all the rules you need.