Trust me, I got 7/9 and completely forgot what kepler's 2nd law was in my trial. You would easily get 9, but definitely don't write a response that long in hsc. I think all you needed for 9 marks was:

-Kepler's first law states that objects move in elliptical orbit, while his 2nd law states that the objects sweep out equal areas in ewual times, meaning the velocity is lower further away from the focus, spends more time further away

-Due to the conservation of energy, potential energy will convert to kinetic as the orbit approaches the apogee, while kinetic will convert to potential as the orbit approaches the perigee

-With Kepler's 3rd law, the period of the orbit can be predicted at a fixed radius, assuming a near circular orbit, mentioning equation for this

-For maintaining orbits - to move up orbits, burning in the direction of the orbit at the perigee allows for a positive work done, allowing for increase in potential energy and therefore radius, mentioning equation.

-For moving down, burning against the direction of orbit at the apogee is the most efficient way to decrease, with work done being negative. Maybe mention orbital decay for circular orbits?

While by all means there should be calculus in the hsc physics course, non calculus waffle in the course we've got is fine lol.