I hope you get to spar with higher ranks, pay attention to what they can tell you.
Other than that: Keep your hands by your nose and make it combinations. Several kicks, different kicks, and follow up with punches. Pay attention, if they drop their hands, go for the head
Don't just rush in, but make a plan of what you are going to do: what kicks and punches you will use, use all in your arsenal when practicing in school, some will take some time to get used to throwing, like spin kicks or so, vs a front kick... and use the front leg! True, the back leg kicks carry more power, but they can be seen on wednesday for a hit on sunday!