-mention all extra-curricular activities; shows you can balance many demanding tasks at once
-quantify or explain any actual achievements at each job - eg. If you were a secretary but you made a database that the company still uses after you left, it sounds as though you went beyond what simply explaining what your day-to-day secretarial tasks were
-make sure you can speak to every statement you make; if you say “I feel my strong-will and independent personality would fit well in your bank” make sure you can explain why that sounds like it would fit in with their bank