The toughest job interview questions are often those that require us to tell about our greatest accomplishments. First, you have to know what those are--which ones will be impressive to the hiring manager? Next, you need to be prepared to explain those achievements. They want to know details.
In the video below, I will give you a very easy way to prepare interview answers that will get you the offer.
If you want more help, see my blog series, How to Answer Interview Questions. You'll see detailed examples for 101 tough job interview questions.