Ask lots of questions regarding compensation and how they will structure your exit plan.
Business dress is required, have some knowledge of the industry client service as that is the most crucial part of the job. Be there on time and be prepared to answer scenario questions and complete paperwork
I searched about the company before I applied and after I was called for interview.
It's most preferable that you research the background of IG to find out what it offers and what kind of services they can make available to you (insurance, mutual funds, mortgages, etc.)
Just be confident