I see you're looking for help for a job application. We can't give you answers that will work specifically for you. But we CAN get your ideas flowing.
Think about your strengths in general. Are you well organized? Are you able to be highly focused? Are you self motivated?
Here's a thought. As an assistant, one of the best things you can do is provide support. As you get better, your boss's job will get easier and easier. What boss wouldn't appreciate that motivation?
(Be sure you use proper spelling and grammar on every answer. Good luck!!!)