Answer:
It depends on which stance you are taking, but either way you could use shocking (but real) facts or sensory imagery.
Explanation:
For example, if you were arguing that private were better you could include facts about better chances at college admissions or vividly describe the bad parts of public schools such as gross lunches and/or the effects of underfunding.
On the other hand, if you wanted to support public schools in your essay you could include information about how free education helps increase opportunities for low income youth or describe the free students feel without uniforms.
Either way, the hook is a small part of your essay and once you write the whole thing you might be able to get some ideas. Good luck!
