Bdogz, high 40's low 50's /84 is shit; But it depends on what ATAR your aiming for. . . .
If you're aiming for 85, It's reasonable
95, You need to step it up
99, No chance.
And to the person above me. I am not lyounamu but...
Find dSA/dt; and equate to 0.1 and solve for k, and Voila...