I think that depends first of all on how much the interest on your student debt is and will be, how much you think the markets will give you in the next 4 years, and how you will feel if you divest to pay for school and the markets go up for 4 years straight, or, conversely, if you stay invested and the markets drop 40% or so at some point. And also how secure is your 100K job, and how risk prone or adverse you are.
Faced with a similar decision (w.r.t. a mortgage) I decided that debt well below 4% might make sense not to repay straight away, as the "safe" withdrawal rate is calculated at 4%, and basically any money in the markets *should* repay your interest on the same amount of money, plus inflation, with some risk covered by the interest being "well below" 4%. If the debt is at or above 4% the call is tighter. Definitely at 5-6% or more I would pay the debt first.