Upvote:1
As you're primarily a student, you would indicate that in the question that asks for Present Work/Education/Training Information, selecting STUDENT as your primary occupation. You have the opportunity in Briefly describe your duties section to make mention of your part-time employment.
When you go on to Previous Work/Education/Training Information and add current (and any previous employers), you can show the date to present (e.g., when you're completing the form) and again note in duties that you are employed part time while in school.