One of the best ways to get through to a successful job interview is by knowing one’s strengths.
Make a self assessment and find out what your strengths are. Go look at your work experience and assess how you have performed in various duties and functions. Be objective and try to determine how each decision or accomplishment you made defines a particular strength. By having carefully determined your strengths you can be more confident in explaining them when you are interviewed for a job.
You can do the same thing when it comes to determining your weaknesses. But in this case, use the information to further improve them.