I think the only thing you "must" do to not squander the opportunity is be passionate, which implies following your interests. Anything you can latch on to in y

I think the only thing you "must" do to not squander the opportunity is be passionate, which implies following your interests. Anything you can latch on to in your studies will help you make progress. As for your secondary work, use that time to think or simply rest your brain. Your subconscious requires downtime to solve problems and integrate what you learn; never underestimate the value of regimented idleness. Above all, enjoy! In the worst case, you'll learn a great deal and move on.